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12 June, 12:27

Jana wants to build a pyramid by stacking cups upside down on each other. If the top of the pyramid has 1 cup and the bottom of the pyramid has 6 cups, how many rows of cups are in Jana's pyramid?

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Answers (2)
  1. 12 June, 12:38
    0
    Step-by-step explanation:

    Given:

    At the top:

    1 cup

    At the bottom:

    6 cups

    Using arithmetic progression,

    First row, a = 1

    Common difference = 1

    Final row, an = 6

    We are assuming n = number of rows.

    Therefore the arithmetic progression, an = ao + (n - 1) d

    Inputting values,

    6 - 1 = n - 1

    n = 6

    = 6 rows.
  2. 12 June, 12:48
    0
    Rows of cups in Jana's pyramid = 7 cups

    Step-by-step explanation:

    Rows of cups in Jana's pyramid = 6 + 1 = 7 cups
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