Answer :

The missing number is 25.
the series-
4, 9, 16, 25, 36, 49, 64
Calculate it like this-
2², 3², 4², 5², 6², 7², 8²
kopal
the answer is 25 and the logic do u know i shall tell u the logic is:- odd no.s starting from 5 , the difference between 4 and 9 is 5 then difference between 9 and 16 is 7 then the next odd no. is 9 so 16+ 9 = 25, and then difference between 25 and 36  is11, difference between 36 and 49 is 13 and the difference between 49 and 64 is 15. The series is :- 4,9,16,25,36,49,64.
hope this helps u to understand the logic and the answer!!!!!!!!!!

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