sar2ietrelorev sar2ietrelorev

24-05-2016
Mathematics

Answered

What is the sum of the first 45 terms of the following sequence? 20, 18, 16, . . .

A1,080
B1,420
C1,530
D1,980

Verified Answer :

Anonymous Anonymous

26-05-2016

Sn = (a1+an) n / 2
an = a1+d(n-1)

d = 18-20 = -2
a45 = a1+d(45-1) = 20 - 2(45-1) = -68
S45 = (20-68)*45/2 = -1080

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