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If x : y = 3 : 1 , then x^3 - y^3 : x^3 ...

If x : y = 3 : 1 , then `x^3 - y^3 : x^3 + y^3 = ?`

A

`13:14`

B

`14 : 13`

C

`10 : 11 `

D

`11 : 10`

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The correct Answer is:
A
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