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[" 11Let "*" be a binary operation on "N...

[" 11Let "*" be a binary operation on "N" defined by "a^(*)b=LCM" of and "],[b;AA a,b in N" .Prove that "(20*16)*8=20*(16*8).],[" Sol.By cummutating Law,"],[" LHS "=(20*16)*8=320*8=2560],[" RHS "=20^(4)(16*8)=20*128=2560],[:." LHS "=" RHS Proved."]

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