Find the radius and centre of the sphere x2 + y2 + z2 - 6x + 8y - 12z – 20 = 0

1
9 and (3, -4, 6)
2
4 and (-3, 4, -6)
3
20 and (6, - 8, 12)
4
10 and (-6, 8, -12)

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