−5+(−8)+(−11)+...+(−230)


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Question Number 199863 by Karanji last updated on 10/Nov/23

$- 5 + (- 8) + (- 11) + . . . + (- 230)$
	Answered by som(math1967) last updated on 10/Nov/23
	$c.d=(−8)−(−5)=−3 −230=−5 +(n−1)×−3 ⇒(n−1)=75 ⇒n=76 S_(76) =((76)/2){−10+75×(−3)} =38×(−235)=−8930$
	$c . d = (- 8) - (- 5) = - 3$ $- 230 = - 5 + (n - 1) \times - 3$ $\Rightarrow (n - 1) = 75$ $\Rightarrow n = 76$ $S_{76} = \frac{76}{2} {- 10 + 75 \times (- 3)}$ $= 38 \times (- 235) = - 8930$
	Commented by Karanji last updated on 10/Nov/23

	$s i r t h a n k y o u$
	Commented by Karanji last updated on 10/Nov/23

	$h a p p y d i w a l i s i r$
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