Find the sum: -5+(-8)+(-11)+....+(-230)
Answers
Answered by
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Step-by-step explanation:
a = -5 , d = -8 -(-5) = -8+5 = -3
An = a + (n-1)d
-230 = -5 + (n-1)-3
-225 = -3(n-1)
75 = n - 1
n = 76
N पदों का योग = n/2 {2a+(n-1)d}
= 76/2 {-10+(75)-3}
= 38 {-10 - 225}
= 38 * -235
= -8930
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