Which of the following equations should be solved to find the position of the term in…

MATHEMATICS · Single correct · A Level · Mathematics · Sequences and series · Sequences and series

Problem

Which of the following equations should be solved to find the position

n

of the term

68

in the arithmetic progression

5,\,8,\,11,\dots

? (a)

5 + 3n = 68

(b)

5 + (n+1)\times 3 = 68

(c)

5 + (n-1)\times 3 = 68

(d)

68 = 5(n-1) + 3