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P ( 2 , 2), Q ( - 4, 4) and R (5 , - 8) ...

P ( 2 , 2), Q ( - 4, 4) and R (5 , - 8) are the vertices of a `DeltaPQR`, then median from 'R' is .....

A

`sqrt(147)`

B

`sqrt(157)`

C

`4sqrt(17)`

D

`2sqrt(13)`

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