Paint cube


  • 0
    C

    There are one thousand 1x1x1 cubes in a 10x10x10 cube. If we took a can of spray paint, and completed painted the entire outside of the larger cube, how many smaller cubes will have paint on them?

    Total # of cubes: 1000

    of small cubes with 3 sides painted: 8

    of small cubes with 2 sides painted: 8 *12 = 96

    of small cubes with 1 side painted: 8 * 8 * 6 = 384

    static public int numberOfCubePaint(int n) {

    if (n==0) return 0;
    else if (n==1) return 1;
    else
    return 8+(12 * (n-2))+((n-2)*(n-2)*6);


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