Thanks for your reply. From the two formulas you provided above, only (1) looks familiar to me, as for the (2), is it possible for you to prove it (i.e. how to obtain that formula..)? Thanks....
Thanks for your reply. From the two formulas you provided above, only (1) looks familiar to me, as for the (2), is it possible for you to prove it (i.e. how to obtain that formula..)? Thanks....
Google "geometric progression" or "geometric sequence"