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If d(1) and d(2) are the longest the sho...

If `d_(1)` and `d_(2)` are the longest the shortest distance of (-7,2) from any point `(alpha, beta)` on the curve whose equation is `x^(2)+y^(2)-10x-14y=51` then G.M. of `d_(1)` and `d_(2)` is

A

`sqrt(11)`

B

7

C

2

D

`2sqrt(11)`

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