Grade Select GradeAlgebra
Please tell me Q.128....
Please tell me Q.128....
1 Answer
Vandana Kumari
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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