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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_2\ : r_1` is equal to (a) `1\ :3` (b) `1\ :2` (c) `2\ :1` (d) `3\ :1`

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