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If a : b = 3 :sqrt5, then the value of (...

If `a : b = 3 :sqrt5`, then the value of (2a + b) : (3a - 2b) is:

A

`1/61(64+21sqrt(5))`

B

`1/64(64+21sqrt(5))`

C

`1/63(64+21sqrt(5))`

D

`1/62(64+21sqrt(5))`

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The correct Answer is:
A
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