Number series
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See all →- What will come in place of the question mark (?) in the series?3, 8, 18, 38, 78, ? Answer: B. 158 Answer: (B) 158 Each term = previous × 2 + 2. 78 × 2 + 2 = 158. 1
- What will come in place of the question mark (?) in the series?5, 6, 14, 45, 184, ? Answer: D. 925 Answer: (D) 925 Pattern: ×1 + 1, ×2 + 2, ×3 + 3, ×4 + 4, so next = 184 × 5 + 5 = 925. 1
- What will come in place of the question mark (?) in the series?120, 119, 115, 106, 90, ? Answer: C. 65 Answer: (C) 65 Subtract squares: −1, −4, −9, −16, −25. 90 − 25 = 65. 1
- What will come in place of the question mark (?) in the series?6, 7, 15, 42, 106, ? Answer: D. 231 Answer: (D) 231 Add cubes: +1, +8, +27, +64, +125. 106 + 125 = 231. 1
- Find the wrong number in the series.2, 6, 15, 31, 56, 93 Answer: A. 93 Answer: (A) 93 Differences should be 2², 3², 4², 5², 6² = 4, 9, 16, 25, 36: 2, 6, 15, 31, 56, 92. So 93 is wrong. 1
- What will come in place of the question mark (?) in the series?7, 15, 31, 63, 127, ? Answer: B. 255 Answer: (B) 255 Each term = previous × 2 + 1. 127 × 2 + 1 = 255. 1