Question

Evaluate the series 8 simga 5n n=3.In this image, the lower limit of the summation notation is n=3

Answer 1

The answer is 165.

The values of n from 3 to 8 are what we substitute into our expression, 5n:

5(3)+5(4)+5(5)+5(6)+5(7)+5(8)
=15+20+25+30+35+40
= 165.

Answer 2

The value of
`\sum_(n=3)^(8)5n` is 165.

Explanation:

We have to evaluate sigma 5n from n=3 to 8 taht is:

`\sum_(n=3)^(8)5n`

Thus, substituting the value of n from 3 to 8 in the above equation, we get

=
`5(3)+5(4)+5(5)+5(6)+5(7)+5(8)`

=
`15+20+25+30+35+40`

=
`165`

Thus, the value of
`\sum_(n=3)^(8)5n` is 165.