If a=2b and A=3B, find the angles A, B, ...

If `a=2b` and `A=3B`, find the angles A, B, C of `DeltaABC` :

A

`90^@, 30^@, 60^@`

B

`30^@, 60^@, 90^@`

C

`45^@, 45^@, 90^@`

D

data insufficient

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A

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