Asked by anonymous
How many terms of the series 25+19+13 +… are required to make the sum −20?
Answers
Answered by
oobleck
a = 25
d = -6
You want n such that
n/2 (25 + (n-1)(-6)) = -20
Now just solve for n
d = -6
You want n such that
n/2 (25 + (n-1)(-6)) = -20
Now just solve for n
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