Series
- Select the number that can replace the question mark (?) in the following series.1, 8, 27, 64, ? Answer: B. 125 Answer: (B) 125 The terms are cubes: 1³, 2³, 3³, 4³ . Next is 5³ = 125 . 1
- Select the number that will come in place of the question mark (?) in the following series.2, 5, 10, 17, 26, ? Answer: C. 37 Answer: (C) 37 Differences are 3, 5, 7, 9, so the next difference is 11: 26 + 11 = 37 . (Also n² + 1 for n = 1 to 6.) 1
- Select the letter that will come in place of the question mark (?) in the following series.Z, W, S, N, ? Answer: B. H Answer: (B) H Positions: Z = 26, W = 23, S = 19, N = 14. Gaps are −3, −4, −5, so next is −6: 14 − 6 = 8 = H. 1
- Select the number that will come in place of the question mark (?) in the following series.2, 3, 10, 15, 26, 35, ? Answer: D. 50 Answer: (D) 50 Terms are n² + 1 for odd n and n² - 1 for even n: 1²+1, 2²-1, 3²+1, 4²-1, 5²+1, 6²-1 . Next: 7² + 1 = 50 . 1
- Select the number that will come in place of the question mark (?) in the following series.4, 9, 25, 49, 121, ? Answer: D. 169 Answer: (D) 169 These are squares of consecutive prime numbers: 2², 3², 5², 7², 11² . Next prime is 13, so 13² = 169 . 1
- Select the letter-cluster that will come in place of the question mark (?) in the following series.BY, DW, FU, HS, ? Answer: B. JQ Answer: (B) JQ First letters: B, D, F, H, J (+2). Second letters: Y, W, U, S, Q (−2). Next term = JQ. 1
- Select the number that will come in place of the question mark (?) in the following series.1, 2, 6, 21, 88, ? Answer: B. 445 Answer: (B) 445 Pattern: × 1 + 1, × 2 + 2, × 3 + 3, × 4 + 4 : 1 → 2 → 6 → 21 → 88. Next: 88 × 5 + 5 = 445 . 1
- Select the number that will come in place of the question mark (?).5, 11, 23, 47, 95, ? Answer: D. 191 Answer: (D) 191 Each term = previous × 2 + 1: 5×2+1 = 11, 11×2+1 = 23, … 95×2+1 = 191. 1
- Select the number that will come in place of the question mark (?).1, 8, 27, 64, ?, 216 Answer: D. 125 Answer: (D) 125 The terms are cubes: 1³, 2³, 3³, 4³, 5³, 6³ . Missing term = 125. 1
- Select the letter pair that will come in place of the question mark (?).AZ, BY, CX, DW, ? Answer: C. EV Answer: (C) EV The first letters go A, B, C, D, E (forward); the second letters go Z, Y, X, W, V (backward). Next pair: EV. 1
- Select the number that will come in place of the question mark (?) in the series.3, 8, 15, 24, 35, ? Answer: B. 48 Answer: (B) 48 Terms are n² - 1 for n = 2, 3, 4, 5, 6: 3, 8, 15, 24, 35. Next: 7² - 1 = 48 . (Differences 5, 7, 9, 11, 13 also... 1
- Select the letter that will come in place of the question mark (?) in the series.B, E, I, N, ? Answer: D. T Answer: (D) T Positions: B = 2, E = 5, I = 9, N = 14. Gaps are +3, +4, +5, so the next gap is +6: 14 + 6 = 20 = T. 1
- Select the number that will come in place of the question mark (?).2, 6, 12, 20, 30, ? Answer: D. 42 Answer: (D) 42 Terms are n(n+1) : 1×2, 2×3, 3×4, 4×5, 5×6. Next 6 × 7 = 42 . 1