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" (ii) "^(n-1)P(r)+r*^(n-1)P(r-1)=^(n)P(...

" (ii) "^(n-1)P_(r)+r*^(n-1)P_(r-1)=^(n)P_(r)

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Prove that .^(n-1)P_(r)+r.^(n-1)P_(r-1)=.^(n)P_(r)

Prove that .^(n-1)P_r+r.^(n-1)P_(r-1)=^nP_r .

Show that , .^(n)P_(r)=n.^(n-1)P_(r-1)=(n-r+1).^(n)P_(r-1) .

What is ""^(n-1)P_(r )+ ""^(n-1)P_(r-1) ?

Prove that ^(n-1) P_r+r .^(n-1) P_(r-1) = .^nP_r

Prove that .^(n-1) P_r+r .^(n-1) P_(r-1) = .^nP_r

Prove ""^(n)P_(r)=""^(n-1)P_(r) +r. ""^(n-1)P_(r-1)

Prove that .^(n)P_(r)=.^(n-1)P_(r)+r.^(n-1)P_(r-1) .

Prove that: ""^(n-1)P_r=(n-r)* ""^(n-1)P_(r-1)