Question

-5+(-8)+(-11) +..........+(-230)​

Answer 1

Step-by-step explanation:

It is an A.P.,

in which, a= -5, d= -8-(-5)=-3, l=-230

First calculate the number in series.....

l=a+(n-1)d

-230=-5+(n-1)-3

-225=-3n + 3

3n=228

n=76.

Now,

Sum of the series  = n/2 (a+l)

  76/2 (-5-230)

38 * -235  = -8930.

So, the sum of your series would be -8930.

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