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30 December, 05:15

A sequence is defined by the recursive formula f (n + 1) = f (n) - 2. If f (1) = 18, what is f (5) ?

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  1. 30 December, 05:21
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    Sub n=1

    f (1+1) = f (1) - 2 = 18

    f (1) = 20

    f (2) - f (1) = - 2, d=-2

    f (5) = 20+d * (n-1) = 20 + (-2) * (5-1) = 20-8 = 12
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