Which of the following expresses the th term of a geometric progression whose first…

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

Problem

Which of the following expresses the

n

th term

a_n

of a geometric progression whose first term is

a

and common ratio is

r

? (a)

a r^{n}

(b)

a r^{n-1}

(c)

a + (n-1)r

(d)

n a r^{n-1}