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The operation * on Q -(1) is define dby ...

The operation * on Q -(1) is define dby a*b = a+b - ab for all a,b `in Q - (1)` Then the identity element in Q -(1) is

A

0

B

1

C

`-1`

D

None of these

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Let '*' be the operation defined on the set Z of integers by the rule a*b=a +b + 1 for all a , b in Z, write down the identity element for this operation.

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Let a mapping '*' from Q xx Q to Q (set of all rational numbers) be defined by a* b = a +2 b for all a, b in Q. Prove that the given operation is not commutative.

MODERN PUBLICATION-RELATIONS AND FUNCTION-EXAMPLE
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