What should come in place of question mark in the following series ?
7 14 25 38 55 74 (?)
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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