Question

How many terms of the series -8, -6, -4, ... make the sum of 90?

Answer 1

Answer:

15

Step-by-step explanation:

Sn=n/2(2a+(n-1)d)

90=n/2[2(-8)+(n-1)2] [d=-6-(-8)=2]

n^2-9n-90=0

By solving get the answer

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Answer 2

Answer:

15 terms

Step-by-step explanation:

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