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Derangement formula two proofs (Hindi): Summation formula & Recursive formula
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Summation formula proof: Dn=n!(1-1/1!+1/2!-1/3!+...+(-1)^n/n!)
Introduction and Recursive relation proof (formula): Dn=(n-1)(Dn-1+Dn-2)
Introduction and Recursive relation proof (formula): Dn=(n-1)(Dn-1+Dn-2)
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