Question:

What is the missing number?

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2,6,_,54,162

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  1. 18.  Multiply up by 3 each time

    2x3 = 6

    6x3 = 18

    18x3 = 54

    and

    54x3 = 162


  2. 18.

  3. 2 = 2 x 1       (1 = 3 at exponent ZERO)

    6 = 2 x 3

    missing: 18 = 2 x  3 x 3

    54 = 2 x 3 x 3 x 3

    162 = 2 x 3 x 3 x 3 x 3

  4. 18.

    Everything is X 3.

    2X3 is 6

    6X3 is 18

    18X3 is 54

    54X3 is 162
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