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Which of the following statement is true...

Which of the following statement is true?

A

`**` defined by `a**b=(a+b)/(2)` is a binary operation on `ZZ`

B

`**` defined by `a**b=(a+b)/2` is a binary operation on `QQ`

C

all binary commutative operations are associative

D

Subtraction is a binary operation on `NN`

Text Solution

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The correct Answer is:
B
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