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An operation performed on two positive integers, a and b, is

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An operation performed on two positive integers, a and b, is [#permalink] New post 13 Sep 2005, 22:50
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An operation performed on two positive integers, a and b, is called left if and only if a@b=b@a for all integers a and b where @ is any operation and the result of the operation plus 3 is always even. Is the operation * <b>left</b>?

(1) a * ; b=a! + b!
(2) In a * ; b, a>b
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 [#permalink] New post 14 Sep 2005, 08:55
I could not conprehend two options. what is semicolon here?
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 [#permalink] New post 14 Sep 2005, 10:29
i think the answer is D

(1) as the result of the operation plus 3 is always even, the result of the operation must be odd. as a!+b! can never be odd the operation a * ; b=a! + b! cannot be left.

(2) for a@b=b@a a and b must be equal. so again a * ; b=a! + b! cannot be left.

correct me please
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 [#permalink] New post 14 Sep 2005, 12:58
I typed it exactly as I read it in the princeton review test. =( OA is E.

duttsit wrote:
I could not conprehend two options. what is semicolon here?

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  [#permalink] 14 Sep 2005, 12:58
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An operation performed on two positive integers, a and b, is

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