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are u sure that c is the OA?crackgmat007 wrote:Given that n is an integer, is n — 1 divisible by 3?
(1) n^2+n is not divisible by 3
(2) 3n + 5 >= k + 8, where k is a positive multiple of 3
OA - C Pls explain.
There are absolutely no exceptions to the rule that the product of three consecutive integers is divisible by 3. Zero is most certainly divisible by 3 (you get an integer when you divide zero by 3), so if you look, say, at the three consecutive integers -1, 0, 1, that list contains exactly one number which is divisible by 3, just like any other list of three consecutive integers.prindaroy wrote:The only exceptions are -1,0,1 since 3 does divide 0*1 but does not divide -1 and the other exception is -2,-1,0 since 3 divides -1*0 but 3 does not divide -2.
thanksIan Stewart wrote:There are absolutely no exceptions to the rule that the product of three consecutive integers is divisible by 3. Zero is most certainly divisible by 3 (you get an integer when you divide zero by 3), so if you look, say, at the three consecutive integers -1, 0, 1, that list contains exactly one number which is divisible by 3, just like any other list of three consecutive integers.prindaroy wrote:The only exceptions are -1,0,1 since 3 does divide 0*1 but does not divide -1 and the other exception is -2,-1,0 since 3 divides -1*0 but 3 does not divide -2.
The answer to the question in the original post is A, not C -- as adityanarula pointed out above, Statement 2 tells us nothing useful.
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