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What is the value of the positive integer m?

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What is the value of the positive integer m? [#permalink] New post 28 Nov 2012, 21:22
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What is the value of the positive integer m?

(1) m^2 = 2m

(2) m is even
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Re: What is the value of the positive integer m? [#permalink] New post 28 Nov 2012, 22:05
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1) m can be 0 or 2. But m is given as a positive integer. So m=2. Sufficient.

2)m can be any positive even number. Insufficient.

Answer is A.

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Re: What is the value of the positive integer m? [#permalink] New post 29 Nov 2012, 01:56
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What is the value of the positive integer m?

(1) m^2 = 2m --> m^2-2m=0 --> m(m-2)=0 --> m=0 or m=2. Since given that m is positive, then m cannot be zero, thus m=2. Sufficient.

(2) m is even --> clearly insufficient, m can be any positive even number.

Answer: A.
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Re: What is the value of the positive integer m?   [#permalink] 29 Nov 2012, 01:56
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