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10 June, 14:44

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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  1. 10 June, 16:57
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    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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