Logic Number Alphabet Alphanumeric Series Competitive Exams
50 questions · IQ Logic and Reasoning
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Question 1 of 50
Find the next term: 0, 1, 1, 2, 3, 5, 8, ?
ExplanationEach term is the sum of the previous two (Fibonacci): 5 + 8 = 13.
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Question 2 of 50
Find the next term: 10, 4, 20, 8, 40, 16, ?
ExplanationThere are two interleaved series: 10, 20, 40, … (×2) and 4, 8, 16, … (×2). The next term is 40 × 2 = 80.
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Question 3 of 50
Find the next term: B, E, H, K, N, ?
ExplanationLetters move forward by 3 each time: N (14) + 3 = Q (17).
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Question 4 of 50
Find the next term: Z, X, V, T, R, ?
ExplanationLetters move back by 2 each time: R (18) − 2 = P (16).
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Question 5 of 50
Find the next term: B2, D4, F6, H8, ?
ExplanationLetters move forward by 2 and numbers increase by 2: J10.
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Question 6 of 50
Find the next term: AZ, BY, CX, DW, ?
ExplanationThe first letter moves forward (A, B, C, D, E) while the second moves back (Z, Y, X, W, V).
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Question 7 of 50
Find the next term: B, D, G, K, P, ?
ExplanationPositions 2, 4, 7, 11, 16 increase by 2, 3, 4, 5, so the next is +6: 22 = V.
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Question 8 of 50
Find the missing term: 5, 11, 23, 47, ?, 191
ExplanationEach term = previous × 2 + 1: 47 × 2 + 1 = 95, and 95 × 2 + 1 = 191.
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Question 9 of 50
Find the next term: C4, F9, I16, L25, ?
ExplanationLetters move forward by 3 and numbers are 2², 3², 4², 5², so the next is 6² = 36.
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Question 10 of 50
Find the next term: 2, 6, 12, 20, 30, ?
ExplanationDifferences are 4, 6, 8, 10, so the next difference is 12: 30 + 12 = 42.
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Question 11 of 50
Find the missing term: 1, 1, 2, 6, 24, ?
ExplanationThe terms are factorials: 1!, 1!?, … Each term is multiplied by 1, 2, 3, 4, 5 in turn: 24 × 5 = 120.
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Question 12 of 50
Find the missing term: 1, 4, ?, 16, 25, 36
ExplanationThese are squares: 1², 2², 3², 4², 5², 6². The missing term is 3² = 9.
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Question 13 of 50
Find the next term: ACE, BDF, CEG, DFH, ?
ExplanationEach letter in the group moves forward by 1: D→E, F→G, H→I.
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Question 14 of 50
Find the next term: AA1, BB2, CC3, DD4, ?
ExplanationThe letter pair and number both advance by 1: EE5.
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Question 15 of 50
Find the next term: 4, 9, 25, 49, 121, ?
ExplanationThese are squares of primes (2, 3, 5, 7, 11). Next prime is 13: 13² = 169.
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Question 16 of 50
Find the next term: 5, 6, 8, 11, 15, ?
ExplanationDifferences are 1, 2, 3, 4, so the next is 5: 15 + 5 = 20.
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Question 17 of 50
Find the next term: AB, DE, GH, JK, ?
ExplanationEach pair moves forward by 3 letters: JK → MN.
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Question 18 of 50
Find the next term: 120, 99, 80, 63, 48, ?
ExplanationThe terms are 11²−1, 10²−1, 9²−1, 8²−1, 7²−1, so the next is 6² − 1 = 35.
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Question 19 of 50
Find the next term: A1B2, C3D4, E5F6, ?
ExplanationLetters follow A, B, C, D, E, F, G, H and numbers 1, 2, 3, …, 8 in sequence.
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Question 20 of 50
Find the next term: 6, 11, 21, 36, 56, ?
ExplanationDifferences are 5, 10, 15, 20, so the next is 25: 56 + 25 = 81.
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Question 21 of 50
Find the next term: Z26, Y25, X24, W23, ?
ExplanationEach letter moves back by 1 and the number equals its position: V = 22.
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Question 22 of 50
Find the next term: 2, 4, 8, 16, 32, ?
ExplanationEach term is double the previous one: 32 × 2 = 64.
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Question 23 of 50
Find the next term: 3, 7, 11, 15, 19, ?
ExplanationEach term increases by 4: 19 + 4 = 23.
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Question 24 of 50
Find the next term: A, C, E, G, I, ?
ExplanationLetters move forward by 2 each time: I (9) + 2 = K (11).
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Question 25 of 50
Find the next term: 1, 4, 9, 16, 25, ?
ExplanationThese are squares of 1, 2, 3, 4, 5. Next is 6² = 36.
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Question 26 of 50
Find the next term: 2A, 4C, 6E, 8G, ?
ExplanationNumbers increase by 2 and letters by 2: 10 and I.
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Question 27 of 50
Find the next term: 5, 10, 20, 40, 80, ?
ExplanationEach term is double the previous one: 80 × 2 = 160.
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Question 28 of 50
Find the next term: 100, 93, 86, 79, 72, ?
ExplanationEach term decreases by 7: 72 − 7 = 65.
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Question 29 of 50
Find the next term: B3, E6, H9, K12, ?
ExplanationLetters move forward by 3 and numbers increase by 3: N15.
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Question 30 of 50
Find the next term: 2, 5, 10, 17, 26, ?
ExplanationThe terms follow n² + 1: 1²+1, 2²+1, …, so the next is 6² + 1 = 37.
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Question 31 of 50
Find the next term: A1, D4, G9, J16, ?
ExplanationLetters move forward by 3 and numbers are squares 1², 2², 3², 4², so the next is 5² = 25.
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Question 32 of 50
Find the next term: 2, 6, 18, 54, ?
ExplanationEach term is multiplied by 3: 54 × 3 = 162.
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Question 33 of 50
Find the next term: 7, 14, 28, 56, ?
ExplanationEach term is doubled: 56 × 2 = 112.
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Question 34 of 50
Find the wrong term in the series: 2, 5, 10, 17, 26, 36
ExplanationThe terms follow n² + 1: 2, 5, 10, 17, 26, 37. So 36 is wrong.
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Question 35 of 50
Find the next term: 1, 8, 27, 64, 125, ?
ExplanationThese are cubes of 1 to 5. Next is 6³ = 216.
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Question 36 of 50
Find the missing term: 2, ?, 12, 20, 30
ExplanationDifferences are 4, 6, 8, 10, so the series is 2, 6, 12, 20, 30. The missing term is 6.
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Question 37 of 50
Find the next term: A2, C6, E10, G14, ?
ExplanationLetters move forward by 2 and numbers increase by 4: I18.
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Question 38 of 50
Find the next term: A1, C3, E5, G7, ?
ExplanationLetters move forward by 2 (A, C, E, G, I) and numbers increase by 2 (1, 3, 5, 7, 9).
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Question 39 of 50
Find the next term: 1, 3, 6, 10, 15, ?
ExplanationThese are triangular numbers. Differences 2, 3, 4, 5, so the next is +6: 21.
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Question 40 of 50
Find the next term: C, F, J, O, ?
ExplanationPositions 3, 6, 10, 15 increase by 3, 4, 5, so the next is +6: 21 = U.
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Question 41 of 50
Find the wrong term in the series: 5, 10, 20, 45, 80, 160
ExplanationEach term is double the previous one: 5, 10, 20, 40, 80, 160. So 45 is wrong.
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Question 42 of 50
Find the next term: 2, 3, 5, 7, 11, 13, ?
ExplanationThese are consecutive prime numbers. The prime after 13 is 17.
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Question 43 of 50
Find the next term: A, D, I, P, ?
ExplanationLetter positions are 1, 4, 9, 16 (squares), so the next is 25 = Y.
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Question 44 of 50
Find the missing term: 3, 6, 12, 24, ?, 96
ExplanationEach term is doubled: 24 × 2 = 48, and 48 × 2 = 96.
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Question 45 of 50
Find the next term: 1, 2, 4, 7, 11, 16, ?
ExplanationDifferences are 1, 2, 3, 4, 5, so the next is 6: 16 + 6 = 22.
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Question 46 of 50
Find the wrong term in the series: 3, 7, 15, 31, 63, 130
ExplanationEach term = previous × 2 + 1: 3, 7, 15, 31, 63, 127. So 130 is wrong.
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Question 47 of 50
Find the missing term: 2, 7, 12, ?, 22, 27
ExplanationEach term increases by 5: 12 + 5 = 17.
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Question 48 of 50
Find the wrong term in the series: 1, 4, 9, 16, 24, 36
ExplanationThe series is of squares: 1, 4, 9, 16, 25, 36. So 24 is wrong.
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Question 49 of 50
Find the next term: 3, 9, 27, 81, ?
ExplanationEach term is multiplied by 3: 81 × 3 = 243.
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Question 50 of 50
Find the next term: Z, W, T, Q, N, ?
ExplanationLetters move back by 3 each time: N (14) − 3 = K (11).
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