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In triangle ABC, AD is median and G is t...

In `triangle ABC`, AD is median and G is the point on AD such that AG: GD = 2: 1, then `ar(triangle ABG) :ar(triangle ABC)` is equal to :
त्रिभुज ABC में, AD मध्यिका है तथा G, AD पर स्थित ऐसा बिंदु है कि AG: GD = 2 : 1 है, तो `ar(triangle ABG) :ar(triangle ABC)` का मान किसके बराबर होगा ?

A

` 1 : 5 `

B

`1 :4`

C

`1 : 6`

D

`1 :3`

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