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Determine which of the following binary ...

Determine which of the following binary opertions on the set R are associative and which are commutative.
`(a) a **b =1 AA a, b in R`
(b) ` a **b = ((a +b))/( 2) AA a,b in R`

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NCERT BANGLISH-RELATIONS AND FUNCTIONS -MISCLELLANEOUS EXERCISE ON CHAPTER 1
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