Find the sum of the A.P : –5 + (–8) + (–11) + . . . + (–230)
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Find the sum of the A.P : –5 + (–8) + (–11) + . . . + (–230)
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Answer:
Explanation:
according to me your answer is 17
l=a+(n−1)d
−230=−5+(n−1)−3
−225=−3n+3
3n=228
n=76.
Now,
Sum of the series =
2
n
(a+l)
76/2(−5−230)
38×−235=−8930.
So, the sum of your series would be −8930