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Q 2386480377.     A spherical ball which is 7 cm in diameter is melted into 3 spherical balls. The diameter of two balls so formed is 3 cm and 4 cm.
I. Find the diameter of the 3rd ball.
II. Find the sum of the radius of the three balls.
IBPS-PO 2017 Mock Mains
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)