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Answer

Correct Option is 9

Even number is followed by an nonprime odd number so =18- 15 = 3
The row is 3 6
Odd number is followed by an even number so =3 *6 = 18(sum of 1 row)
Even number is followed by an odd number (prime) so =8 +3= 11
The sum of the rows is 20 so the sum of second row= 20- 18 = 2
When X = 9, then the second row is 11 9
Odd number is followed by a perfect square so 11-9=2.so this condition can satisfy only when X=9.

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