Explicit formula?

0 ⤊

For the nth term of the geometric sequence 3, 6, 12, 24...

I forgot how to write it.

2007-05-22 17:48:45 · 3 answers · asked by cosmichorizon 3 in Science & Mathematics ➔ Mathematics

Also for 16, 8, 4, 2.

I know it's 1/2 I just don't know how to write it.

2007-05-22 17:54:19 · update #1

a subn = 3 * 2^(n-1)

AND

a subn = 16 * (1/2)^(n-1)

=]

..

2007-05-22 17:57:39 · answer #1 · answered by Anonymous · 0⤊ 0⤋

Term "n" = 3 x 2^(n-1)

2007-05-23 00:57:43 · answer #2 · answered by cattbarf 7 · 0⤊ 0⤋

3*2^(n-1)

2007-05-23 00:53:56 · answer #3 · answered by Velkomen 2 · 0⤊ 0⤋