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A spherical ball of radius r(1) units is...

A spherical ball of radius `r_(1)` units is melted to make 8 new identical balls each of radius `r_(2)` units. Then `r_(1) : r_(2)` is

A

`2 : 1`

B

`1 : 2`

C

`4 : 1`

D

`1 : 4`

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