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Module 1: Geometric sequences

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Core Mathmatics - Example (b)

Example (b)

Is this a geometric sequence?

Three friends start a school business selling collector cards. It proves
to be so successful that each friend is able to recruit six more students
to be sellers each week. Each seller is able to recruit six more in each
week following. Is this a geometric progression? {3, 21, 147, 1029 . . . }

It is a geometric sequence (GP) with r = 7.

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