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

MATHEMATICS · Single correct · CBSE · Mathematics · Arithmetic Progressions · Arithmetic Progressions

Problem

Which of the following expresses the

n

th term

a_n

of an arithmetic progression whose first term is

a

and common difference is

d

? (a)

a_n = a - (n - 1)d

(b)

a_n = a + nd

(c)

a_n = a + (n - 1)d

(d)

a_n = \dfrac{n}{2}\bigl[2a + (n - 1)d\bigr]