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Question

Find the sum of the series 23 + 18 + 13 + . . .+ (-82)

A) -590
B) 590
C) -649
D) 649

14 years ago

Answers

MathMate
Number of terms
=(23-(-82))/5+1
=22

Sum = (first term + last term)*number of terms / 2
=(23+(-82))*22/2
=-59*11
=-649
14 years ago
Robo123
Thanks. Mange to figure it out. Got the same answer as you.

14 years ago
MathMate
You're welcome!

How did you do it?
14 years ago

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