Q. In the series – 142, 139, 134, 127, 116, 103, X – what is the value of X?

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Solution

The correct option is C 86
The differences between the adjacent numbers are 3, 5, 7, 11, 13, i.e. differences form the series of prime numbers. So, the next difference will be of 17, and 103 – 17 = 86.

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