please help share matlab command

Answer 1

[Walter Roberson]

Hint:

syms n
symsum( 1/factorial(n), n, 0, 10)

ans = 

Second hint:

you can break up the second sum into three pieces: the sum from -20 to -1, the value for 0 exactly, and the sum for 1 to 10. And you can evaluate at 0 exactly by using limit() .

If you do not do this, then you will encounter division by 0.

[parid]

thank a lot for suggest to me.

Thank you so much