JEE Main 1-Sep-2021 Shift 2 Solved Paper

Section: Mathematics

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Question : 75 of 90

Marks: +1, -0

Let Sn=1.(n−1)+2.(n−2)+3.(n−3)+.......+(n−1).1,n≥4.

The sum sum‌

∞

Σ

n=4

(

2Sn

n!

−

1

(n−2)!

) is equal to

[1 Sep 2021 Shift 2]

e−1
3
e−2
6
e
3
e
6

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