alleryFind the next: 3, 7, 15, 31, 63, ?
A125
B99
C127
D95
Answer & Solution
Correct answer: C. 127
Each term is 2 × previous + 1: 3
→ 7 (2×3+1), 7 → 15 (2×7+1), 15
→ 31, 31 → 63, 63 → 127. Or 2ⁿ⁺¹ - 1.
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