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Glossary Math & Statistics

Number sequence

A number sequence is an ordered list of numbers that follows a rule; the common kinds are arithmetic (add a constant) and geometric (multiply by a constant).

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In more detail

In the arithmetic sequence 3, 7, 11 the 10th term is 3 + 9 × 4 = 39; in the geometric sequence 2, 6, 18 the 6th term is 2 × 3⁵ = 486. The sum of the first n terms of an arithmetic sequence is n × (first + last) / 2.

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See also

  • Glossary Exponent
    An exponent says how many times to multiply a base by itself: in `2³` the base is 2, the exponent is 3, and the value is 8.
  • Glossary Mean, median and mode
    The mean is the sum divided by the count, the median is the middle value when sorted, and the mode is the most frequent value.
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