What is the missing number ‘X’ of the series 7, X, 21, 31, 43?

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Q 2514245150.     What is the missing number ‘X’ of the series 7, X, 21, 31, 43?
IAS 2015 Prelims
A

1 1

B

1 2

C

1 3

D

1 4

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

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