arithmetic sequence

Question

What are the first five terms in the arithmetic sequence a_n=8n, starting with n=1.    Please help..

 

A) {1/8, 1/16, 1/24, 1/32, 1/40}

B) {1, 2, 3, 4, 5}

C) {9, 10, 11, 12, 13}

D) {8, 16, 24, 32, 40}

Answer 1

Carlos,

 

If the arithmetic sequence is a_n = 8n, this means that for

n = 1, a₁ = 8 x 1 = 8

n = 2, a₂ = 8 x 2 = 16

n = 3, a₃ = 8 x 3 = 24

n = 4, a₄ = 8 x 4 = 32

n = 5, a₅ = 8 x 5 = 40

 

Therefore the answer is D

 

Hope it helps.