UPSC NDA Math Model Paper 10

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Comprehension:(Que No. 92 - 93)
Consider the spheres x2+y2+z2−4y+3=0
And x2+y2+z2+2x+4z−4=0
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Question : 92 of 120
 
Marks: +1, -0
What is the distance between the centers of the two spheres?
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