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The height and radius of the cone of whi...

The height and radius of the cone of which the frustum is a part are h_1 and r_1 respectively. If h_2 and r_2 are the heights and radius of the smaller base of the frustum respectively and h_2 : h_1 = 1 :2, then r_1 : r_2 is equal to__

A

1 : 3

B

1 : 2

C

2 : 1

D

3 : 1

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