Monday, 12 February 2018

calculus - frac16+frac56.12+frac5.86.12.18+frac5.8.116.12.18.24+cdots.



How to find the sum




16+56.12+5.86.12.18+5.8.116.12.18.24+.





I have tried to make this series in the form 1+nx+n(n+1)x22!+n(n+1)(n+2)x33!+. But I failed to do so. Can anyone please help me


Answer



Like Calculating 1+13+1336+135369+135736912+?,



If S=16+56.12+5.86.12.18+5.8.116.12.18.24+.



2S=26+256.12+25.86.12.18+25.8.116.12.18.24+




2S+1+13



=1+231!(36)+23(231)2!(36)2+23(231)(232)3!(36)3+



=(112)2/3


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