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# [ds] a?

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VP
Joined: 29 Apr 2003
Posts: 1405
Followers: 2

Kudos [?]: 18 [0], given: 0

[ds] a? [#permalink]  15 Apr 2006, 06:00
00:00

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Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
a,b,c are integers. What is a?

1. (a-7)(b-7)(c-7)=0
2. bc=18
Intern
Joined: 04 May 2004
Posts: 48
Location: India
Followers: 0

Kudos [?]: 20 [0], given: 0

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
_________________
Senior Manager
Joined: 11 Nov 2005
Posts: 332
Location: London
Followers: 1

Kudos [?]: 8 [0], given: 0

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
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