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[ds] a? [#permalink] New post 15 Apr 2006, 07:00
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a,b,c are integers. What is a?

1. (a-7)(b-7)(c-7)=0
2. bc=18
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 [#permalink] New post 15 Apr 2006, 07:29
Quote:
a,b,c are integers. What is a?

1. (a-7)(b-7)(c-7)=0
2. bc=18


Statement 1 tells that either a-7 or b-7 or c-7 is 0. It does not tells us for sure if a-7 is 0 or not.

Statement 2 tells us that b and c both are non zero but it does not tells us what is a. It also tells us that b and c are one of 1,2,3,6,9,18.

Combining the two, we know that b and c are not equal to 7. a-7 has to be 0 and thus a = 7
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 [#permalink] New post 15 Apr 2006, 18:40
Agree C.

s4ur4bh wrote:
Quote:
a,b,c are integers. What is a?

1. (a-7)(b-7)(c-7)=0
2. bc=18


Statement 1 tells that either a-7 or b-7 or c-7 is 0. It does not tells us for sure if a-7 is 0 or not.

Statement 2 tells us that b and c both are non zero but it does not tells us what is a. It also tells us that b and c are one of 1,2,3,6,9,18.

Combining the two, we know that b and c are not equal to 7. a-7 has to be 0 and thus a = 7
  [#permalink] 15 Apr 2006, 18:40
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