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Is ab divisible by c? 1. a is not divisible by c 2. b is not

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Joined: 04 Jan 2006
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Is ab divisible by c? 1. a is not divisible by c 2. b is not [#permalink]  01 Dec 2007, 16:36
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Is ab divisible by c?
1. a is not divisible by c
2. b is not divisible by c
CEO
Joined: 17 Nov 2007
Posts: 3578
Concentration: Entrepreneurship, Other
Schools: Chicago (Booth) - Class of 2011
GMAT 1: 750 Q50 V40
Followers: 406

Kudos [?]: 2133 [0], given: 359

Expert's post
asdert wrote:
why not C?

1&2
a=15, b=7, c=6 - (15*7)(mod6)=(3*5*7)(mod6)>0
a=15, b=14, c=6 - (15*14)(mod6)=(3*5*7*2)(mod6)=0
INSUFF.
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