Question

find the sum of the AP
34,32,30,.......,10​

Answer 1

The answer is in the above attachment
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Answer 2

sum of ap =sn=n/2(2a+(n-1)d

s10 =10/2 (2(34) +(10-1)-2

s10 =5(68-18)

s10 = 5(50)

s10 =250