miko4kia0sonvaleyro miko4kia0sonvaleyro

24-05-2016
Mathematics

Answered

What is the sum of the first 27 terms of the following sequence? 1, 5, 9, 13, . . .

A1,431
B1,571
C2,862
D2,943

Verified Answer :

Anonymous Anonymous

26-05-2016

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

d = 5-1 = 4
a27 = a1+d(27-1) = 1 + 4(27-1) = 105
S27 = (1+105)27/2 = 1431

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