In the Challenge Archive, 2002 JUL-SEP, September 30th "Neighborly Numbers"
Given that n is an integer, is n "” 1 divisible by 3?
(1) n² + n, is not divisible by 3
(2) 3n+5 ≥ k+8, where k is a positive multiple of 3
I know that using Statement (1) (n-1)n(n+1) is three consecutive integers and that three consecutive integers are divisible by 3, but if n is 1 than (n-1) would equal 0 and this would not be, right? unless 0 is supposed to be divisible by 3???
Statement (2) break down this and it tells you that n ≥ 2, not sufficient
I was sure that this answer was C because the question does not specify that n is an integer greater than 1. So using both statements n ≥ 2 and the product of any three consecutive integers is divisible by 3.
But the answer is A???
Anyone???