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24 December, 07:32

Starting with one, every consecutive line has a number that is one more then twice the previous line, how many marbles must be in the sixth line?

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  1. 24 December, 07:52
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    63 marbles

    1

    1 X 2 + 1 = 3

    3 * 2 + 1 = 7

    15 * 2 + 1 = 31

    31 * 2 + 1 = 63
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