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The external and the internal radii of a...

The external and the internal radii of a hollow right circular cylinder of height 15 cm are 6.75 cm and 5.25 cm respectively. If it is melted to form a solid cylinder of height half of the orignal cylinder, then the radius of the solid cylinder is-

A

6 cm

B

6.5 cm

C

7 cm

D

7.25 cm

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The correct Answer is:
A
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