Question

find the sum of -1+2+5+.....296
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Answer 1

Step-by-step explanation:

Since this is an A.P.

So a is -1

l is 296

d is 3

Now we'll find the n th term

So,

n th term = a +(n-1)d

So let n th term be l i.e. 296

So 296=-1+(n-1)3

-1+3n - 3

-4+3n

296+4=3n

300=3n

n=100

So we'll put it the formula of sum of an A.P.

So

n/2(a+l)

putting the values

100/2(-1+296)

50(295)

=1475

Therefore, Answer is 1475

Hope you are able to understand it.

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