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 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 3, 10, 27, 4, 16, 64, 5, 25, 125

C. 10

In alphabet series, some alphabets are missing which are given in that order as one of the alternatives below it. Choose the correct alternative. - ccb _ c _ bbc _ b _ cc _ _ ccbb

A. BCCBBB

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

A. 27