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13 January, 20:40

How many 4-digit numbers can you write if you cannot use any other digits except 0, 1, and 2?

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Answers (2)
  1. 13 January, 21:29
    0
    You have a choice of only 3 digits to fill in 4 places.

    You can place any of 3 digits in each of the 4 places, so you get

    3 * 3 * 3 * 3 = 81
  2. 14 January, 00:22
    0
    Think of the four digit number like a slot. Each slot has 3 different possibilities so that makes the total slot have 3*3*3*3 probabilities, so 81
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