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```        find
1.1!+2.2!+3.3!+............nterms```
7 years ago

147 Points
```										Dear tejas
S=1.1!+2.2!+3.3!+............nn!
rearrange
S=(2-1)1!  +(3-1) 2! +(4-1) 3!+.......(n+1-1) n!
=2 1!  -1 1!  +3 2! -1 2! + 4 3 ! -1 3!...............(n+1) n!  - 1 n!
=2! -1! +3! -2! +4! -3! +..............(n+1)! -n!
=(n+1)! -1

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```
7 years ago
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