Question

Hey, i need help with this question. can anyone help me?

Answer 1

The answer is 47 or the other answer connected to it is 23

Answer 2

The given sequence is:

`7,21,63,189,\cdots`

The first term of the sequence is 7.

Notice that the sequence has a common ratio of:

`r=(21)/(7)=(63)/(21)=\cdots=3`

The recursive formula of a geometric series is:

`a_n=a_(n-1)(r)`

Substituting r=3 gives:

`a_n=3a_(n-1)`