The first four terms are 3 9 27 81 and 729 is the 6th term.
9, 10, 11 and 12
a, ar, ar^2 and ar^3 where a and r are constants.
If you mean nth term 2n then the 1st four terms are 2 4 6 and 8
1, 16, 81, 256 14641 is the 11th term.
5
The first four terms are 3 9 27 81 and 729 is the 6th term.
2
6
9, 10, 11 and 12
a, ar, ar^2 and ar^3 where a and r are constants.
29
If you mean nth term 2n then the 1st four terms are 2 4 6 and 8
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1, 16, 81, 256 14641 is the 11th term.
If the nth term is 8 -2n then the 1st four terms are 6, 4, 2, 0 and -32 is the 20th term number
n = 1 ---> 3 * 1 + 3 = 6 n = 2 ---> 3 * 2 + 3 = 9 first 2 have difference of 3, so you can keep adding 3 to find more terms. 6, 9, 12, 15