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" 5.If "^(n)C(r-1)=^(n)C(3r)," find "r...

" 5.If "^(n)C_(r-1)=^(n)C_(3r)," find "r

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If .^(n)P_(r)=.^(n)P_(r+1) and .^(n)C_(r)=.^(n)C_(r-1) , find n and r.

If ""^(nP_(r)=""^(n)P_(r+1) and ""^(n)C_(r)=""^(n)C_(r-1) find n and r.

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