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UPSC NDA I 2016 Mathematics Solved Paper

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For the next two (2) items that follow :
Consider the two circles
(x−1)2+(y−3)2=r2 and x2+y2−8x+2y+8=0

[NDA I 2016]

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Question : 40

Total: 120

What is the distance between the centre of the two circles ?

5 units
6 units
8 units
10 units

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