Determine which of the following binary ...

Determine which of the following binary operations on the set N are associative and which are commutative.(a) `( b ) (c) ab = 1AA a , b in N (d)`(e) (b) `( f ) (g) ab=( h )(( i )(a+b)/( j )2( k ) (l)AAa , b in N (m)`(n)

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Determine which of the following binary operations on the set N are associative and which are commutative.(a) `( b ) (c) ab = 1AA a , b in N (d)`(e) (b) `( f ) (g) ab=( h )(( i )(a+b)/( j )2( k ) (l)AAa , b in N (m)`(n)