If f(x)=x^2 and x is a positive integer, which of the following will not be the value of f(f(x))?	Options
A) 1	B) 16	C) 81	D) 256	E) 144
f(x)=x^2   f(f(x)) = (x^2)^2   =x^4   A. 1 , x=1   B. 16 , x=2   C. 81 , x=3   E. 144   f(x)=12   Square root of 12 is not a positive integer . Hence 144 can not be the value of f(f(x)) .   D. 256 , x=4   Answer 144
<result>E</result>
If f(x)=x^2 and x is a positive integer, which of the following will not be the value of f(f(x))?