To prove: That the D n = n ! ( 1 − 1 1 ! + 1 2 ! − 1 3 ! + ... + ( − 1 ) n 1 n ! ) by using the formula D n = n D n − 1 + ( − 1 ) n , ( n = 2 , 3 , 4.. ) .

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Chapter 6, Problem 20E

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To prove: That the Dn=n!(1−11!+12!−13!+...+(−1)n1n!) by using the formula Dn=nDn−1+(−1)n,(n=2,3,4..).

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