Answer / geetha

25,36,49,81 can only b squares of 5,6,7,9 resp...
where as 64 we can write as sq of 8 and cube of 4..

Answer / pradeep papabathini

Answer is 64 because its 4 cube remaining were perfect squares

Answer / abd

i got it another way too...all the numbers except 36 is
continuosly divisble by a single prime number but the
number 36 is divisible by 2 prime numbers and that is 2 & 3.

Answer / chandrasekar.s

64 is answer .... because


25-> 2+5=7 odd number
36-> 3+6=9 odd number
49-> 4+9=13 odd number
64-> 6+4=10 Even numbmer
81-> 8+1=9 odd number

so all are getting odd numbers except 64...so it is the
answer..

Answer / lokesh

81

Answer / neha

answer is 64 because in all others the digits are coprimes..
n 6,4 are nt coprimes..

Answer / parvinder

reverse each digit u will get
52,63,94,46,18
only 63 is odd

Answer / murali

5,6&8,9 are composite nos & 7 is not

Answer / suresh kumar

Answer is 100 Because Its in square of numbers 5 square is
25 like that 10 square is 100

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