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Please tell me Q.128....

Please tell me Q.128....

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Grade:Select Grade

1 Answers

Vandana Kumari
31 Points
6 years ago
2(1/1!+(1+2)/2!+(1+2+3)/3!......)
Tn=2n(n+1)/2(n!)
=n+1/(n-1)!
=n-1+2/(n-1)!
=1/(n-2)!+2/(n-1)!
S=∑1/(n-2)!+2∑1/(n-1)!
=e+2e=3e
 

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