How many terms of the series -20, -16, -12, ... must be taken so that the sum is 120 ?

How many terms of the series -20, -16, -12, ... must be taken so that

1.	How many terms of the series -20, -16, -12, ... must be taken so that the sum is 120 ?
A.	5
B.	20
C.	15
D.	10
Answer» D. 10

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How many terms of the series -20, -16, -12, ... must be taken so that the sum is 120 ?

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