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4 February, 11:26

Leo the rabbit hops 1 or 2 stairs how many different ways can he climb 10 stairs

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  1. 4 February, 11:44
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    1,1,1,1,1,1,1,1,1,1

    1,1,1,1,1,1,1,1,2

    1,1,1,1,1,1,2,2,

    1,1,1,1,2,2,2,

    1,1,2,2,2,2

    2,2,2,2,2
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