## Answers

10 a a) Defi Define na yi= n-y on a So yon=yon . clearly not yon a) nay & Y*n So binany operation is not commutative uty = n-y1 G - Ty-m = Y K n . manutative So the binary operation is coman (e) n* 7 = uty & ny. - y + a + ya = y * n.

.
So the binary operation is commutative (d) m*y - (m+y ?(4-0)**41)*'). - y + 1 + (-) + 2 + 1) La Yan So the binary operation is commutativel

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