In following number series, two terms have been put within brackets. Choose the appropriate option - 1,2,3,6,9,18, x ,54

D. 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. - 2, 3, 5, 7, 11, x, 17

B. 13

In following number series, two terms have been put within brackets. Choose the appropriate option - Look at this series: 22, 21, 23, 22, 24, 23, . . . What number should come next?

C. 25

In following number series, two terms have been put within brackets. Choose the appropriate option - Look at this series: 2, 4, 6, 8, 10, . . . What number should come next ?

B. 12

In following number series, two terms have been put within brackets. Choose the appropriate option - Look at this series: 40, 40, 47, 47, 54, . . . What number should come next?

C. 54