If n is an integer, what is the remainder when n is divided by 7?
(1) n+1 is divisible by 7
(2) n+8 is divisible by 7
Let's tackle this one.
Statement 1: n+1 = 7k, then n = 7k-1
So when divided by 7 the remainder will be -1. But we can't have a remainder of -1. So what we'll do is correct for the excess. Just add 7 and voila you will have a remainder of 6.
This is suff
Statement 2: n+8 = 7p, n= 7p-8. Same thing here we have a negative remainder of -1. Add 7. Remainder 6.
This is suff as well.
So answer is in fact (D)
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