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22 November, 08:18

Sarah watched the Scarecrow scare away 2 crows on Monday 5 crows on Tuesday 11 crows on Wednesday and 23 crows on Thursday Sarah notice a pattern forming can you predict how many crows could be scared away on Friday Saturday and Sunday

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  1. 22 November, 09:57
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    I got 47 because ...

    Tn = Tn-1 + 3*2^ (n - 1)

    Using the above formula,

    T2 = 2 + 3*2^ (1-1) = 2 + 3*2^0 = 2 + 3 = 5

    T3 = 5 + 3*2^ (2-1) = 5 + 6 = 11

    T4 = 11 + 3*2^ (3-1) = 11 + 12 = 23

    T5 = 23 + 3*2^ (4-1) = 23 + 24 = 47
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