What will come in place of the question mark (?) in the series?7, 15, 31, 63, 127, ?
A. 259
B. 255
C. 253
D. 254
1 answer
Best answer
Answer: B. 255
Answer: (B) 255
Each term = previous × 2 + 1. 127 × 2 + 1 = 255.
Doubtly AI
· 27 Oct 2026
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