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Expert replies
Source: — Problem Solving |

by homersimpson » Sat Dec 19, 2009 10:11 am
I just put in values like

n=10, 11, 12 and then 13 and now 13x5=65

and 56-65= -9 and mod - 9 is positive 9 so B.

I found this to be the easiest way.
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by Xbond » Sat Dec 19, 2009 10:27 am
thks, I start fom 1 to 10 and I stop it. why do you start at 10 ?
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by homersimpson » Sat Dec 19, 2009 10:58 am
see mine was a hit and trial methid, the mod just clicked me I thought I have to take the value of the expression in negative and that only starts with 12 onwards.
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