# Is this correct? Arithmetic sum and sequence #sum_(n=51)^100 7n#

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#sum_(n=51)^100 7n#

#S_n=50/2 (357+700)= =26,425#

#a_100=7(51)+7(100−51)=700#

##### 1 Answer

Apr 19, 2018

See below.

#### Explanation:

You need the sum from

First term is 7 and common difference is 7:

So you are correct, or we are both wrong.