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UPSC NDA II 2014 Mathematics Paper

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For the next two (02) items that follow:
Consider the circles x2+y2+2ax+c=0 and x2+y2+2by+c=0

[NDA II 2014]

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Question : 49

Total: 120

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

√a2+b2
a2+b2
a+b
2(a+b)

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