Math Q

[rajkoneru]

Can you please let me know the solution for this with explaination.Thanks

If n is a positive integer and r is the remainder when (n-1)(n+1) is divided by 24, what is
the value of r?
(1) 2 is not a factor of n.
(2) 3 is not a factor of n.

[Guest]

Can you please let me know the solution for this with explaination.Thanks

If n is a positive integer and r is the remainder when (n-1)(n+1) is divided by 24, what is
the value of r?
(1) 2 is not a factor of n.
(2) 3 is not a factor of n.

This is a SETS Question.

[shaji]

(n-1)(n+1)=n^2-1( A perfect square less 1) is always divisible by 24 when n has neither 2 and 3 as factors.

The correct answr is C.

Can you please let me know the solution for this with explaination.Thanks

If n is a positive integer and r is the remainder when (n-1)(n+1) is divided by 24, what is
the value of r?
(1) 2 is not a factor of n.
(2) 3 is not a factor of n.

[RonPurewal]

Please POST A SOURCE for each question that you post - book, question # (or, if it's from GMATPrep or an online CAT, then the first few words of the problem statement).

Thanks.