snowbirdskier wrote:
If a, b, and c are integers, what is the value of a?
(1) (a - 7)(b - 7)(c - 7) = 0
(2) bc = 18
Given: a, b, and c are integers
Asked: What is the value of a?
(1) (a - 7)(b - 7)(c - 7) = 0
means either a or b or c = 7
But it does not mean that a must be 7
NOT SUFFICIENT
(2) bc = 18
Value of (b,c) pairs = {(1,18),(2,9),(3,6),(6,3),(9,2),(18,1)}
NOT SUFFICIENT
Combining (1) & (2)
(1) (a - 7)(b - 7)(c - 7) = 0
means either a or b or c = 7
(2) bc = 18
Value of (b,c) pairs = {(1,18),(2,9),(3,6),(6,3),(9,2),(18,1)}
It means that b & c are NOT = 7
a = 7
SUFFICIENT
IMO C
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Kinshook Chaturvedi
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