91Ó°ÊÓ

Write the first five terms of the sequence whose general term is$a_n=\frac{(n-1)!}{(n+1)!}$

Write the first five terms of the sequence whose general term is $a_n=\frac{n!}{(n+1)!}$.

Expand the partial sum and find its value:$\underset{i=1}{\overset{5}{∑}}3i$

Expand the partial sum and find its value:$\underset{i=1}{\overset{5}{∑}}4i$

Expand the partial sum and find its value:$\underset{k=0}{\overset{3}{∑}}\frac{2}{k!}$

In the following exercises, find each sum.

$\underset{i=1}{\overset{30}{∑}}\left(-5i+1\right)$

Write the first five terms of the sequence whose general term is$a_n=2n−5$

Expand the partial sum and find its value:$\underset{k=0}{\overset{3}{∑}}\frac{3}{k!}$

Write the sum using summation notation:$\frac{1}{2}+\frac{1}{4}+\frac{1}{8}+\frac{1}{16}+\frac{1}{32}.$

Write the sum using summation notation:$1+\frac{1}{4}+\frac{1}{9}+\frac{1}{16}+\frac{1}{25}$.