SOLUTION: determine the number of terms in the arithmetic series... a sub 1 = -27 a sub n = -51 s sub n = -195

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Question 646268: determine the number of terms in the arithmetic series...
a sub 1 = -27
a sub n = -51
s sub n = -195

Answer by ewatrrr(24785)   (Show Source): You can put this solution on YOUR website!
 
Hi,
arithmetic series
****
-195 = n(-27 + -51)/2
-195 =( -78/2)n
-195/-39 = n
5 = n
Note: = -27 + 4d = -51, d = -6
{-27,-33,-39,-45,-51}
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