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If the arithmetic mean of two positive n...

If the arithmetic mean of two positive numbers a & b `(a gt b)` is twice their geometric mean , then a : b is

A

`2 + sqrt3 : 2 - sqrt3`

B

`4 + 4sqrt3 : 1`

C

`1 : 7 - 4 sqrt3`

D

`2 : sqrt3`

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A, B, C
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