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AJB77
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If x, y are positive integers, is x*y even? S1. When 02 Jul 2005, 21:08
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If x, y are positive integers, is x*y even？

S1. When x^3+y^3 is divided by 4, the remainder is 1.

S2. When x^2+y^2 is divided by 8, the remainder is 3.



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HIMALAYA
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If x, y are positive integers, is x*y even? S1. When 02 Jul 2005, 23:34
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D. from both statements, it is known that either of one statement is even and the other one is odd. so the at least one even integer is enough to say that the product of xy is even.
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sparky
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If x, y are positive integers, is x*y even? S1. When 03 Jul 2005, 01:25
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AJB77
If x, y are positive integers, is x*y even？

S1. When x^3+y^3 is divided by 4, the remainder is 1.

S2. When x^2+y^2 is divided by 8, the remainder is 3.
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1) the sum needs to be odd, either x or y is even, suff
2) same, suff
D.
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Folaa3
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If x, y are positive integers, is x*y even? S1. When 03 Jul 2005, 07:29
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It has to be D

for each stmt to be divisible by 4 and 8 yet leave a remainder, either x or y has to be even or odd.
even * odd = even.



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