Teaching UP TGT Mock Test Series 2025 Mathematics

What is the equation of the sphere with unit radius having centre at the origin?

1
x2 + y2 + z2 = 0
2
x2 + y2 + z2 = 1
3
x2 + y2 + z2 = 2
4
x2 + y2 + z2 = 3
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