In following number series, two terms have been put within brackets. Choose the appropriate option - 9 , 12 , 11 , 14 , 13 , x , 15

B. 16

In following questions, one term in number series is incorrect. - Find out the incorrect number 5, 10, 40, 80, 320, 550, 2560

C. 550

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 / √5, 3 / 5, 4 / 5√5, 5 / 25,(.....)

B. 6 / 25?5

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. - 21, 25, 33, 49, 81,

A. 145

In following questions, one term in number series is incorrect. - Find out the incorrect number 56, 72, 90, 110, 132, 150

D. 150