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4 October, 02:33

A sequence is defined by the formula f (n+1) = f (n) - 3. If f (4) = 22, what is f (1) ?

10

13

+5
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  1. 4 October, 02:35
    0
    f (1) = 13

    Step-by-step explanation:

    f (n+1) = f (n) + 3

    then

    f (n) = f (n+1) - 3

    then

    f (3) = f (4) - 3 = 22 - 3 = 19

    f (2) = f (3) - 3 = 19 - 3 = 16

    f (1) = f (2) - 3 = 16 - 3 = 13
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