EANAHIG EANAHIG

28-04-2016
Mathematics

contestada

Find the sum of the geometric sequence –3, 15, –75, 375, … when there are 7 terms and select the correct answer below.

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Panoyin Panoyin

29-04-2016

-3, 15, -75, 375,…
×5 ×5 ×5

aⁿ = a₁rⁿ⁻¹
aⁿ = 3(5)ⁿ⁻¹

a₅ = -1875
a₆ = 9375
a₇ = -46875

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