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possible value

by Xbond » Sat Dec 19, 2009 10:03 am
Hi there,

I pick E but the OA is [spoiler]B
[/spoiler]

If n is a positive integer, which of the following is a possible value of |56 - 5n| ?

A. 7
B. 9
C. 12
D. 15
E. 20
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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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Junior | Next Rank: 30 Posts
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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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