Instructions

What should come in place of question mark in the following series ?

Question 187

7 14 25 38 55 74 (?)

Solution

Clearly , 14 - 7 = 7

25 - 14 = 11

38 - 25 = 13

55 - 38 = 17

74 - 55 = 19

Hence , the next difference must be the next prime number which is 23.

So, X - 74 = 23

X = 97

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