Q106
One term in the number series is wrong. Find out the wrong term. 3, 7, 15, 39, 63, 127, 255, 511
A.
15
B.
39
AnswerC.
63
D.
127
Answer: Option B
Solution
Answer: Option B
Solution:
The correct pattern is x 2 + 1.So, 39 is wrong and must be replaced by (15 x 2 + 1) i.e. 31.