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# Properties of Odd Numbers

ALGEBR-EINKNK

Given the digits $W, X, Y$ and $Z$, if $WX$ is an odd number and $YZ$ is an odd number, which of the following must be odd?

A

$WX + YZ$

B

$WX - YZ$

C

$(WX)(YZ)$

D

$\cfrac{WX} {YZ}$