Question

In each of the following questions , one term is wrong. Find out the wrong term.

1, 3, 7, 15, 27, 63, 127

• A. 7
• B. 15
• C. 27
• D. 63
• E. 3

Answer 1

The correct option is C 27

The sequence is $2,2^2,2^3,2^4,2^5,2^6$ etc. so the correct term is 15+16 $=$ 31. [Double+1 is the rule]. So 27 is wrong , 31 is right.