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Math Expert
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Re: The integer x is even and the integer y is odd. Is the integer z odd? [#permalink]
Bunuel wrote:
The integer x is even and the integer y is odd. Is the integer z odd?


(1) xyz+ 1 is odd.

(2) xy + xz + yz is even.


even = e, odd = o

e.e = e e+e=e
e.o=e e+o=o
o.o =o o+o=e

use this and its easy
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Re: The integer x is even and the integer y is odd. Is the integer z odd? [#permalink]
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