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Compress the expression of factorial:



e = (Correct answer is: 12n+30) Wrong answer


e=(n+6)!/(n+4)!n!/(n2)! e=(n+6)(n+5)(n+4)!/(n+4)!n(n1)(n2)!/(n2)! e=(n+6)(n+5)n(n1) e=n2+6n+5n+6 5n2n e=12n+30

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