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[" 1."quad 1+1.1!+2.2!+3.3!+.....+n.n!,"...

[" 1."quad 1+1.1!+2.2!+3.3!+.....+n.n!," is equal to "],[[" 1) "n!," 2) "(n-1)!," 3) "(n+1)!," 4) "n]]

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