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If the circle C1: x^2+y^2=16 intersect a...

If the circle C1: `x^2+y^2=16` intersect another circle C2 of radius 5 in such a way that common chord is of maximum length and has a slope equal to 3/4, then coordinates of the centre of C2 is: a. `(9/5,12/5)` b. `(9/5,-12/5)` c. `(-9/5,-12/5)` d. `(-9/5,12/5)`

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