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3?

by sanju09 » Mon Mar 26, 2012 1:02 am
Is q = 3?
(1) q^4 = 81.
(2) |q| = 3.
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by Anurag@Gurome » Mon Mar 26, 2012 1:34 am
sanju09 wrote:Is q = 3?
(1) q^4 = 81.
(2) |q| = 3.
(1) q^4 = 81
If q = 3, then q^4 = 81
If q = -3, then also q^4 = 81
No definite answer; NOT sufficient.

(2) |q| = 3
If q = 3, then |q| = 3
If q = -3, then |q| = |-3| = 3
No definite answer; NOT sufficient.

Combining (1) and (2), we don't get any new info, so again no definite answer; NOT sufficient.

The correct answer is E.
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