Prove the following: P(n , r)=P(n-1, r)+...

Prove the following: `P(n , r)=P(n-1, r)+rdotP(n-1,\ r-1)`

Prove the following: P(n , r)=P(n-1, r)+rdotP(n-1,\ r-1)
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Prove :nPr=n(n-1)P(r-1)
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P(n,r)+P(n-1,r-1)=
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The number of ways in which n different thingscan be distributed into ...
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Prove the following: P(n , r)=P(n-1, r)+rdotP(n-1,\ r-1)
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Prove the following: P(n , r)=ndotP(n-1,\ r-1)
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Prove that : (i) (n!)/(r!)=n(n-1)(n-2)...(r+1) (ii) (n-r+1)*(n!)...
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निम्नलिखित को सिद्ध कीजिए : P(n,r)=P(n-1,r)+r.P(n-1,r-1)
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निम्नलिखित को सिद्ध कीजिए : P(n,r)=n.P(n-1,-1)
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