Question

If a1, a2,...,an are in HP, then the expression at a1a2 + a2a3 + ...+ an - 1 an is equal to

(a) (n - 1)(a1 - an)

(b) na1an

(c) (n -1)a1an

(d) n(a1 - an)

Answer 1

Correct option (c) (n -1)a1an

Explanation:

On putting the value of d in Eq, (i), we get