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solve question number 20 ND 21
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in 20th question, u just have to equate the volume of sphere with the number of volume of cones and will get the answer...
4/3πrsq.=n×1/3πrsq.h
and in 21st u have to equate the tsa of sphere with the volume of sphere...
4πrsq.=n×4/3πrsq.
the formulae may be wrong but the method is correct...
hope it helps u.
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I hope this will help u.
plz mark as brainliest.....
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