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If a=2b=8c and a+b+c = 13 then the value...

If a=2b=8c and a+b+c = 13 then the value of `(sqrt(a^2+b^2+c^2))/(2c)` is:
यदि a=2b=8c है, तथा a+b+c = 13 है, तो `(sqrt(a^2+b^2+c^2))/(2c)` का मान क्या होगा ?

A

`9/2`

B

`5/6`

C

`-9/2`

D

`-5/6`

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