It may be the case with geometric sequences that the graph will increase or decrease. So let's write this down. For calculator. And then finally A sub four, which I will do in a color that I'll use, I'll do it in yellow.
It's going to be A sub two, three minus one is two, three minus two is one. The common ratio is usually easily seen, which is then used to quickly create the recursive formula.
Which is equal to So it's equal to six times three six times three. A times A sub zero.
Now let's move on to A sub three. The sequence shown in this example is a famous sequence called the Fibonacci sequence.