shilpaqueen wrote:Is n Divisible by 39?
1.N is divisible by 65
2. N is divisible by 78
My answere D
Officail answer B...why??
If N is a multiple of 39 means N is a multiple of (3*13). Thus, we need to see which contains 39 or 3 and 13 both as a factor is the options.
1. N is divisible by 65
=> N is divisible by (5 * 13)
So N may or may not be divisible by 39 as we are not sure if N contains a 3 or not. (Insufficient)
2. N is divisible by 78
=> N is divisble by (2 * 3 * 13)
So N must be divisible by 39 as we are sure N is a multiple of both 3 and 13. (Sufficient)
Moreover, 78 itself is a multiple of 39.
If something is div by 78 then bound to be div by 39.
Thus, B
