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Re: odd/even - tough one [#permalink]
25 Jul 2009, 16:45
1) wx + yz is odd. So wx is even, yz is odd or wx is odd and yz is even. if wx is even then w/x is odd or even (w = 6, x = 2 w/x = 3 or w=8, x=2 w/x = 4) if wx is odd then w/x is odd Similarly for yz also. so w/x + y/z might be odd or even. 2) wz + xy is odd w/x + y/z = (wz + yx)/xz and since w/x and y/z are integers wz/xz, yx/zx will also be same integers. So (wz + yx)/xz is odd