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UPSC NDA I 2014 Mathematics Paper

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For the next two (02) items that follow:
Consider the spheres
x2+y2+z2−4y+3=0 and x2+y2+z2+2x+4z−4=0

[NDA I 2014]

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Question : 64

Total: 120

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

5 unit
4 unit
3 unit
2 unit

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