For a, b in R, define a ** b = (a)/(a+b)...

For a, `b in R`, define `a b = (a)/(a+b), a + b ne 0`. If `a b = 5`, then the value of b * a is

A

5

B

`-5`

C

4

D

`-4`

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The correct Answer is:

D

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