If P,Q,R be the A.M., G.M., H.M. respect...

If P,Q,R be the A.M., G.M., H.M. respectively between any two rational numbers a and b, then P-Q is `:`

A

`(a-b)/( a)`

B

`(a+b)/( c ) `

C

`( 2ab)/( a+b)`

D

`( ( sqrt( a) - sqrt(b))/(sqrt(2)))^(2)`

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The correct Answer is:

D

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