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If the circle `x^2+y^2+2gx+2fy+c=0` is touched by `y=x` at `P` such that `O P=6sqrt(2),` then the value of `c` is 36 (b) 144 (c) 72 (d) none of these

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If the circle `x^2+y^2+2gx+2fy+c=0` is touched by `y=x` at `P` such that `O P=6sqrt(2),` then the value of `c` is 36 (b) 144 (c) 72 (d) none of these
A. 36
B. 72
C. 144
D. 288
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Correct Answer - B
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