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What is the 8th for the geometric sequence 6,561;−2,187;729;−243;…
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Aug 20, 2018
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What is the 8th for the geometric sequence 6,561;−2,187;729;−243;…
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Neocotic
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1st let's calculate r the common ratio:
r = (-2187)/(6561) = (729)/(-2187) = -1/3
Value of nth term = a₁.rⁿ⁻¹, where a₁= 1st term and n, the rank
Value of nth term = 6561r⁸⁽⁻¹⁾ = 6561.(-1/3)7
Value of nth term = -3
Mdubez
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Aug 24, 2018
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