Series
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See all →- Select the letter or letter-cluster that can replace the question mark (?) in the following series.AB, CD, EF, GH, ? Answer: C. IJ Answer: (C) IJ Consecutive pairs of letters: AB, CD, EF, GH, then IJ. 1
- Select the number that can replace the question mark (?) in the following series.2, 5, 11, 23, 47, ? Answer: C. 95 Answer: (C) 95 Rule: ×2 + 1. 2×2+1 = 5, 5×2+1 = 11, 11×2+1 = 23, 23×2+1 = 47. Next: 47 × 2 + 1 = 95. 1
- Select the number that can replace the question mark (?) in the following series.4, 6, 10, 16, 24, ? Answer: A. 34 Answer: (A) 34 The differences are 2, 4, 6, 8, so the next difference is 10. 24 + 10 = 34. 1
- Select the number that can replace the question mark (?) in the following series.7, 8, 12, 21, 37, ? Answer: D. 62 Answer: (D) 62 The differences are 1, 4, 9, 16, that is 1², 2², 3², 4² . Next difference = 5² = 25 , so 37 + 25 = 62. 1
- Select the number that can replace the question mark (?) in the following series.6, 13, 27, ?, 111 Answer: D. 55 Answer: (D) 55 Rule: ×2 + 1. 6×2+1 = 13, 13×2+1 = 27, so the missing term is 27×2+1 = 55. Check: 55×2+1 = 111. ✓ 1
- Find the wrong number in the following series.1, 3, 7, 15, 32, 63 Answer: D. 32 Answer: (D) 32 Rule: ×2 + 1 (or 2ⁿ - 1 ): 1, 3, 7, 15, 31, 63. The term 32 should be 15 × 2 + 1 = 31, so 32 is wrong. 1