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+1 vote
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in Mathematics by (150k points)

If the two circles (x – 1)2 + (y – 3)2 = r2 and x2 + y2 – 8x + 2y + 8 = 0 intersect in two distinct points, then

(a) r < 2 

(b) r = 2

(c) r > 2 

(d) 2 < r < 8.

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