Which of the following gives the th term of an arithmetic progression whose first…

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

Problem

Which of the following gives the

n

th term

a_n

of an arithmetic progression whose first term is

a

and common difference is

d

? (a)

a_n = a + nd

(b)

a_n = a + (n-1)d

(c)

a_n = \dfrac{2a + (n-1)d}{2}

(d)

a_n = a - (n-1)d