What is the missing number `'X'` of the series `7, X, 21, 31, 43?`

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Q 2412123930.     What is the missing number `'X'` of the series `7, X, 21,
31, 43?`
IAS 2015 Prelims
A

`11`

B

`12`

C

`13`

D

`14`

HINT


Solution
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)

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