# How do you find the sum of the series #i# from i=1 to 18?

##### 1 Answer

Nov 13, 2016

# sum_(i=1)^18 i = 171 #

#### Explanation:

Using the standard results:

We have;

# sum_(i=1)^18 i = 1/2(18)(18+1) #

# :. sum_(i=1)^18 i = 1/2(18)(19) #

# :. sum_(i=1)^18 i = 171 #