Difference AP

Calculate the difference of arithmetic progression if the sum of its first 19 members Sn = 8075 and the first member is a1 = 20

Correct answer:

d =  45

Step-by-step explanation:

S=n2a1+an 8075=19220+20+(191)d 850=220+(191)d 810=18d d=45 S=20+65+110+155+200+245+290+335+380+425+470+515+560+605+650+695+740+785+830=8075



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