DS - remainder : Value r

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DS - remainder : Value r

by Xbond » Sun Oct 04, 2009 8:01 am
Hi there,

Could you help me to resolve this PS and explain the step of resolution

If n is a positive integer and r us the remainder when (n-1)(n+1) is divided by 24, what is the value of r ?

1) n is not divisible by 2

2) n is not divisible by 3
Source: — Data Sufficiency |