If p and r are integers, and p^2 = 36r, then r must be divisible by which of the following?
Answers: A) 2 B) 4 C) 9 D) 7 E) 14
Ans: D   Solution: for p to be an int 36 r must be whole square of a number.   36r= 9*2*2*r   to make it whole square we need 9   so r can must be divisible by 9y where y is itself a whole square.   so 9 is the ans
<result>C</result>
If p and r are integers, and p^2 = 36r, then r must be divisible by which of the following?