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24 March, 23:13

How many three-digit positive integers exist, all of whose digits are 2's and/or 5's?

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  1. 24 March, 23:17
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    8

    Step-by-step explanation:

    There are two choices for each digit, and 3 digits, so 2^3 = 8 possible numbers. Here's a list:

    222, 225, 252, 255

    522, 525, 552, 555
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