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11 September, 19:34

Cannon balls for an antique cannon are stacked next to it in four layers to form a square pyramid. How many cannon balls are in a pryimad

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  1. 11 September, 21:21
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    The amount of balls in a given layer can be found by squaring the layer it is in

    4 layers

    top layer (1st) is 1

    2nd is 4

    3rd layer is 9

    4th is 16

    add them up

    1+4+9+16=30

    30 in that pyramid
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