Question

12. (6 Pts.) Show that on every set of three or more integers there are two...

12. (6 Pts.) Show that on every set of three or more integers there are two of them x and y such that the number
xy(x + y)(x ? y) is a multiple of 10.

(x-y)

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12. (6 Pts.) Show that on every set of three or more integers there are two of them x and y such that the number

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