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{{ printedBook.courseTrack.name }} {{ printedBook.name }} A sequence where each term is multiplied by the same number, $r,$ to get the next term is a geometric sequence. The number $r$ can be any non-zero real number. In the following example, $r$ is $2,$ making each term twice as large as the previous.

Similar to other sequences, the first term is usually called $a_{1},$ the second $a_{2},$ and so on.

The number $r$ is called the *common ratio* of the sequence.