Same as above, (E) here's what I did:
If k is a positive integer, is k the square of an integer?
k = +integer; k = x²?
(1) k is divisible by 4.
k -> 2,2,...? in its prime factors
If k -> 2,2 then k will be a perfect square.
If k -> 2,2,3 then k will not be a perfect square.
Insufficient
(2) k is divisible by exactly four different prime numbers.
k -> a,b,c,d...? in its prime factors
If k -> a,b,c,d then k will not be a perfect square
If k -> a²,b²,c²,d² then k will be a perfect square
Insufficient
(3) Combined:
k -> 2²,b,c,d...?
If -> 2²,b,c,d then k will not be a perfect square
If -> 2²,b²,c²,d² then k will be a perfect square
So both statements are insufficient
"There's a difference between interest and commitment. When you're interested in doing something, you do it only when circumstance permit. When you're committed to something, you accept no excuses, only results."
