oh great I cannot even think about that solution ! thank you very much ! Can you help me with another problems
n is an integer between 2 and 84. What is the value of n?
(1) The square root of n is divisible by 5.
(2) n is both the square and the cube of an integer.
Answer would be "D"
n should be a perfect square as squareroot of n is divisible by 5
So perfect square between 2 and 84 are 4,9,16,25,36,49,64,81
Now only sqrt(25) is divisible by 5, hence sufficient
Perfect cube between 2 and 84 are : 8,27,64..
Perfect squares are: 4,9,16,25,36,49,64,81
Hence n= 64. Sufficient.