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In DeltaABC if r(1)=2r(1)=3r(3) and D is...

In `DeltaABC` if `r_(1)=2r_(1)=3r_(3)` and D is the mid point of BC then `cos angle ADC=`

A

`7//25`

B

`24//25`

C

`-7//25`

D

`-24//25`

Text Solution

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The correct Answer is:
C
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