Let A = Z × Z and * be a binary operation on A defined by (a, b)*(c, d) (ad bc, bd)

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Let A = Z × Z and * be a binary operation on A defined by
(a, b)*(c, d) (ad bc, bd).  
Find the identity element for * in the set A
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Tags:
Let A = Z × Z and * be a binary operation on A defined by (a
b)*(c
d) (ad bc
bd)
Find the identity element for * in the set A