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25-05-2016
Mathematics

contestada

What is the sum of the first 27 terms of the following sequence? 1, 5, 9, 13, . . .
a. 1,431
b. 1,571
c. 2,862
d. 2,943

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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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