Question

Find the sum of the 34+32+30...+10.

If u know then only answer....
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Answer 1

34+32+30+28+26+24+22+20

+18+16+14+12+10 = 286

Answer 2

Answer:

L= a+(n-1)d

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

10=34-2n+2

2n=26

n=13

Sn =n/2(a+L)

Sn = 13/2(34+10)

Sn = 13*22

Sn = 286(answer)