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11 August, 05:32

If a1 = 10 and an = 3an-1 then find the value of a6.

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  1. 11 August, 08:02
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    a (6) = 2430

    Step-by-step explanation:

    a (1) = 10

    a (n) = 3*a (n-1)

    This is a geometric sequence, with ratio=3

    a (2) = 3*a (1) = 3*10

    a (3) = 3*a (2) = 3²*10

    a (6) = 3⁵*20 = (27*9) * 10=243*10=2430
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