Devoir de Philosophie

Geometric Progression.

Publié le 12/05/2013

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Geometric Progression. Geometric Progression, in mathematics, sequence of numbers in which the ratio of any term, after the first, to the preceding term is a fixed number, called the common ratio. For example, the sequence of numbers 2, 4, 8, 16, 32, 64, 128 is a geometric progression in which the common ratio is 2, and 1, ? ? } , ? , ...?, ... is a ,, , i geometric progression in which the common ratio is ? The first is a finite geometric progression with seven terms; the second is an infinite geometric progression. In . general, a geometric progression may be described by denoting the first term in the progression by a, the common ratio by r, and, in a finite progression, the number of terms by n. A finite geometric progression may then be written formally as and an infinite geometric progression as In general, if the n th term of a geometric progression is denoted by an, it follows from the definition that If the symbol Sn denotes the sum of the first n terms of a geometric progression, it can be proved that The terms in a geometric progression between ai, and aj, i

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