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10 March, 18:34

What sequence is geometric and has 1/4 as it's fifth term and 1/2 as the common ratio?

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  1. 10 March, 21:06
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    Use

    a (i) = a1*r^ (i-1)

    we know that a (5) = a1 * (1/2) ^ (5-1) = a1/16 = 1/4

    solve for a1 = (1/4) * 16=4

    =>

    sequence:

    4,2,1,1/2,1/4,1/8,1/16, ...
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