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UPSC CDS I 2025 Mathematics Paper

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Question Numbers: 51-52
A frustum of a right cone has a top of diameter 2k, bottom of diameter 2·5k and height k.

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Question : 51

Total: 100

What is the whole surface area of the frustum?

39$π $k²/8
41$π $k²/8
43$π $k²/8
45$π $k²/8

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