Odd integer?

[naidusp]

Is Z an odd integer?

(1) Z is divisible by 3

(2) The square root of Z is an integer divisible by 3

[lego2401]

1- Insuff.
2- (root z) = 3Q
root 144 = 12
root 9 = 3
Insufficient
Together, Z is divisible by 9 and has an integer square root.
81 div 9 and integer square root.
144 divisible by 9 and has an integer square root.

Therefore answer E.

[naidusp]

Official Answer is E