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Question
19. The curved surface area of a cone is \( 20 \pi \mathrm { cm } ^ { 2 } \) and its
slant height and radius are consecutive natural
numbers. Then, its volume equals 2) \( 32 \pi \mathrm { cm } ^ { 2 } \) (3) \( 20 \pi \mathrm { cm } ^ { 3 } \) \( - i \) \( ! \)
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