# Interpreting recursive equations to write a sequence that has one geometric mean

However, the ratio between successive terms is constant. For the patterns of dots below, draw the next pattern in the sequence. If we add the first and last terms, we get Luckily there are methods we can use to compute these sums quickly. A sub four is going to be equal to A sub three, A sub three times A sub two. Is the sequence geometric? So four minus one is three, four minus two is two. Arithmetic Sequences.

### Recursive formula calculator

We now turn to the question of finding closed formulas for particular types of sequences. And we're done, A sub four is equal to Is there a recursive formula for the Fibonacci sequence? It's A sub one times A sub two minus two. How many Skittles will be left in the machine after 20 quarters have been inserted? After the first two terms, each term is the sum of the previous two terms. While we have seen recursive formulas for arithmetic sequences and geometric sequences, there are also recursive forms for sequences that do not fall into either of these categories.
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