railway RPF Constable Mock Test Series 2024 Quantitative Aptitude Mensuration Solid Figures

If three solid spheres of metal whose radii are 1 cm, 6 cm and 8 cm are melted to form another solid sphere, then the surface area of new sphere (in cm2) is:

1
364 π
2
243 π
3
324 π
4
642 π
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