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GMAT prep integer problem
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subhasis8877
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papgust
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This is how i solved.
Value of a?
1. (a-7)(b-7)(c-7) = 0
This means that atleast one of values a,b,c must be 7. So, the product of this expression will be 0. But we don't know which one is 7. Insufficient.
2. bc = 18
Insufficient. No info about value a.
Combined,
bc = 2*3*3. We cannot have 7 in any of b and c. So, a must be 7 to satisfy the expression [(a-7)(b-7)(c-7) = 0].
Sufficient.
Value of a?
1. (a-7)(b-7)(c-7) = 0
This means that atleast one of values a,b,c must be 7. So, the product of this expression will be 0. But we don't know which one is 7. Insufficient.
2. bc = 18
Insufficient. No info about value a.
Combined,
bc = 2*3*3. We cannot have 7 in any of b and c. So, a must be 7 to satisfy the expression [(a-7)(b-7)(c-7) = 0].
Sufficient.
