Question

find the sum of 34+32+30+.......10​

Answer 1

Your answer is 286

Thanks :)

Answer 2

Step-by-step explanation:

Given:-

a = 34 , d = - 2 , l = 10

We know that,

Sn = n/2 ( a + l)

We have to find out n =?..

An = a + ( n - 1) d

10 = 34 + ( n- 1) (- 2)

10 = 34 - 2n + 2

10 = 36 - 2n

- 26 = - 2n

n = 13.

S13 = 13/2 ( 34 + 10)

S13 = 13/2 x 44

S13 = 13 x 22

S13 = 286.

Hope it helps u...