In any geometric progression

MATHEMATICS · Single correct · CBSE · Mathematics · Sequences and Series · Sequences and Series

Problem

In any geometric progression, which of the following is always equal to

a_{n-2}\,a_{n+2}

? (a)

a_{n+1}^{\,2}

(b)

a_n^{\;2}

(c)

a_n\,a_{n+1}

(d)

a_n\,a_{n+2}