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If a : b = 2 : 3 and b : c = 2 : 3, then...

If a : b = 2 : 3 and b : c = 2 : 3, then what is the value of `(3a^2+b^2-c^2):(a^2+2b^2-c^2)` ?

A

`5:7`

B

`4:5`

C

`3:5`

D

`3:7`

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The correct Answer is:
D
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