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It takes 6 cubes to build a staircase with the 3 step are shown in the figure then how many cubes will be needed for 11 step?

Science & Mathematics by Anonymous 2018-05-18 16:08:58

Social Science

It takes 6 cubes to build a staircase with the 3 step are shown in the figure then how many cubes will be needed for 11 step?

1 answer

  • Anonymous

    66 cubes. 6 cubes for three steps gives us 1 for the first step 2 for the second and 3 for the third. 1 + 2 + 3 = 6 This is a logical progression which carried to eleven steps give us: 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 + 11 = 66 or 11/2 (1 + 11) = 66

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