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liliy

  • 3 years ago

prove using induction: 1*1!+2*2!...n*n!=(n+1)!-1

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  1. liliy
    • 3 years ago
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    p(k)=1*1!+2*2!....k*k!=(k+1)!-1 p(k+1)=(k+1)!+1+(k+1)!*(k+1)= (k+2)!-1

  2. liliy
    • 3 years ago
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    but then i get stuck... i dont know what to do. on the left side i can take out (k+1)! but i dont see how that helps me

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