# Math Help - two convergent sequences, limit of their product

1. ## two convergent sequences, limit of their product

Hello.

Could someone help me prove the following?

$\lim_{n \to \infty } \frac{a_1b_n + a_2b_{n-1}+ ... + a_nb_1}{n} = ab$

What theorem should I use. Toeplitz's theorem doesn't seem to be helpful.