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10-05-2017
Mathematics

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What is the 5th term of this geometric sequence?100, 20, 4, 0.8, …a.124.8b.0.2c.0.16d.0.032?

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ghanami ghanami

13-05-2017

hello :
the common ratio is m 20/100=0.8/4=1/5 = 0.2= r
the nth term is : An =A1 × r^(n-1)
if n=5 the 5th term is : A5 = 100×(0.2)^(5-1) = 100×0.16 =16

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