Select the number that can replace the question mark (?) in the following series.6, 13, 27, ?, 111
A. 54
B. 53
C. 56
D. 55
1 answer
Best answer
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. ✓
Doubtly AI
· 27 Oct 2026
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