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If ** be binary operation defined on R b...

If `**` be binary operation defined on R by `a**b = 1 + ab, AA a,b in R` . Then the operation `**` is
(i) Commutative but not associative.
(ii) Associative but not commutative .
(iii) Neither commutative nor associative .
(iv) Both commutative and associative.

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