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- This is a doubt from permutations and combinations
Sir can you please write, not prove it actually the above quest in terms of n,p,r and P
Answers (1)
@Agnibh Chakraborty ( 9831045936 )
i am confused with language of your question, is p included in n or not. and if not ,p particular things seems to be identical.
in such questtions we need to see options, but the max i understood the question,
the answer is - if p is from n -
nP(r-p) * rPp
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