Question

OR
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Find the sum : (-5) + (-8) + (-11) + ...
+ (-230)
​

Answer 1

Answer:

The Sum is -8930

Step-by-step explanation:

As we can see that the given series is an Arithmetic Progression.

It's,

First term (a) = -5

Last term (Tn) = -230

Common difference (d) = -3

Now,

Tn = a + (n-1)d

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

-225 = (n-1)(-3)

n-1 = 225/3

n = 75+1

n = 76

Now,

Sum = (n/2)(a+Tn) = 38(-5-230) = 38(-235)

Sum = -8930

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Answer 2

Answer:

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