In following number series, two terms have been put within brackets. Choose the appropriate option - 15,31,63,127,255,x

B. 511

In following questions, one term in number series is incorrect. - Find out the incorrect number 3, 10, 27, 4, 16, 64, 5, 25, 125

C. 10

In following question, a number series is given with one term missing. Choose the correct alternative that will same pattern and fill in the blank spaces. - 2, 3, 5, 7, 11, x, 17

B. 13

In following questions, one term in number series is incorrect. - Find out the incorrect number 5, 27, 61, 122, 213, 340, 509

A. 27

In following question, a number series is given with one term missing. Choose the correct alternative that will same pattern and fill in the blank spaces. - 1, 4, 2, 8, 6, 24, 22, 88,

A. 86