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Asked by
drew
Find S10 for (-1) + (-7) + (-13) + (-19) +...
A. 250
B. -280
C. (-23)
D. 132
C.
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Answered by
Reiny
a = -1
d = -6
n = 10
sum(10) = (10/2)(-2 + 9(-6))
= 5(-56) = -280
looks like B)
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