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Define ** on the set of real number by a...

Define `**` on the set of real number by `a ** b = 1 + ab`. Then the operation `**` is

A

commutative but not associative

B

neither commutative nor associative

C

associative but not commutative

D

both commutative and associative.

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A
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KCET PREVIOUS YEAR PAPERS-MODEL TEST PAPER 6 -MATHEMATICS
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