Q.
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a
x2+y2+z2−x+y−4z+12=0
b
x2+y2+z2−5x+y−6z+24=0
c
2(x2+y2+z2)−x+y−4z+12=0
d
x2+y2+z2+x−y+4z−12=0
answer is B.
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