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

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Is ab divisible by c? 1. a is not divisible by c 2. b is not [#permalink] New post 01 Dec 2007, 17:36
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Is ab divisible by c?
1. a is not divisible by c
2. b is not divisible by c
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 [#permalink] New post 01 Dec 2007, 23:44
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.
  [#permalink] 01 Dec 2007, 23:44
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Is ab divisible by c? 1. a is not divisible by c 2. b is not

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