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What is the value of the positive integer m?

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Source: — Data Sufficiency |

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by Anurag@Gurome » Wed Nov 28, 2012 10:48 pm
jbsocal wrote:What is the value of the positive integer m?


(1) m^2 = 2m

(2) m is even

[/spoiler]
(1) m² = 2m
m² - 2m = 0
m(m - 2) = 0
m = 0 or m = 2
m = 0 is not possible as m is given to be a positive integer. Hence, m = 2; SUFFICIENT.

(2) m is even.
m cab be any even integer, so this info is definitely NOT sufficient.

The correct answer is A.
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by jbsocal » Thu Nov 29, 2012 5:55 am
Anurag@Gurome wrote:
jbsocal wrote:What is the value of the positive integer m?


(1) m^2 = 2m

(2) m is even

[/spoiler]
(1) m² = 2m
m² - 2m = 0
m(m - 2) = 0
m = 0 or m = 2
m = 0 is not possible as m is given to be a positive integer. Hence, m = 2; SUFFICIENT.

(2) m is even.
m cab be any even integer, so this info is definitely NOT sufficient.

The correct answer is A.


thanks, this helped me understand the answer better
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