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Source: — Data Sufficiency |
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by reachac » Thu Jul 24, 2008 8:58 pm
IMO E
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ans for remainder

by tejaswinibn » Thu Jul 24, 2008 9:58 pm
[quote="reachac"]IMO E[/quote]
the ans is C
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by reachac » Fri Jul 25, 2008 12:54 am
According to conditions in C, n =5,,7,11,13......

if n=5, then (5-1)(5-2) / 24 , r= 12

if n=7 then (6)(5) /24 , r =6

if n=11 then (10)(9) / 24 r=18

I dont think C can be the ans
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by CITI29 » Mon Jul 28, 2008 9:54 am
Hi Tejaswini,

The question u've posted is wrong ...it actually shld say '.....r is a remainder when (n-1)(n+1) is divided by 24....'.

That way you'll get the answer 'c', if u apply plug in in solution posted by reachac.
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