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Consider the circle x^(2)+y^(2)-4x-2y+c=...

Consider the circle `x^(2)+y^(2)-4x-2y+c=0` whose centre is A(2, 1) If the point P (10, 7) is such that the line segment PA meets the circle in Q With PQ=5, then c=

A

`-15`

B

20

C

30

D

20

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The correct Answer is:
D
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