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12 March, 12:11

The population of a type of local dragonfly can be found using an infinite geometric series where a1 = 65 and the common ratio is 1/6. Find the sum of this infinite series that will be the upper limit of this population.

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  1. 12 March, 12:21
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    In mathematics, number sequencing of the same pattern are called progression. There are three types of progression: arithmetic, harmonic and geometric. The pattern in arithmetic is called common difference, while the pattern in geometric is called common ratio. Harmonic progression is just the reciprocal of the arithmetic sequence.

    The common ratio is denoted as r. For values of r<1, the sum of the infinite series is equal to

    S∞ = A₁ / (1-r), where A1 is the first term of the sequence. Substituting A₁=65 and r=1/6:

    S∞ = A₁ / (1-r) = 65 / (1-1/6)

    S∞ = 78
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