# [MOVED] find a Recursive formula that generates the terms of

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#### Guest

##### Guest
Write a recursive formula that generates the terms of the following:

. . .1, 3, 9, 27

The pattern is as follows:

. . .1-->1
. . .3---> 1x3
. . .9--->3x3
. . .27--->3x9

So:
t1 = 1
t2 = 3
t3 = 9

I am unsure really how to put it into a recursive formula! so yeah!

#### stapel

##### Super Moderator
Staff member
Re: [MOVED] find a Recursive formula that generates the term

bluecow said:
The pattern is as follows:

. . .1-->1
. . .3---> 1x3
. . .9--->3x3
. . .27--->3x9
So what is the pattern? At each stage, what do you do with the previous term to get the next term?

bluecow said:
So: t1 = 1, t2 = 3, t3 = 9
I'm not sure what you mean by "so" here, since this is what you were given, what you started with...?

Eliz.

#### pka

##### Elite Member
$$\displaystyle \L b_1 = 1,\quad n \ge 2\quad \, \Rightarrow b_n = 3b_{n - 1}$$