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[" But identity is unique.Teriective the...

[" But identity is unique.Teriective the rement."],[" Therefore only part (v) has an identity element."],[" Question 11.Let "A=N times N" and "*" be the binary operation on "A" defined "],[" Question "11." Let "A=(a+c,b+d)." Show that "*" is commutative and "],[" by "(a,b)" * "(c,d)=(a+c,b+d)." Show that "],[" associative.Find the identity element for "*" on "A," if any."]

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