5. Sum of first 20 terms of the series -10,-8,-6,...... is:
(1)-580
(2) 180
(3) 200
(4)-600
Answers
Answered by
6
Answer:
common difference =2
a=-10
n=20
S20=20/2*2*-10+20-1*2
=10×-20+38
=180
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