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Please tell me Q.128....
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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