Let G be the geometric mean of two posit...

Let G be the geometric mean of two positive numbers a and b, and M be the arithmetic mean of `1/a and 1/b`if `(1/M):G ` is `4:5`, then `a:b` can be

A

`1 : 4`

B

`1 : 2`

C

`2 : 3`

D

`3 : 4`

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The correct Answer is:

A

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