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-- 893 of them have no 4's.

-- Three of them have exactly one 4: 4xx, x4x, and xx4.

-- Three of them have exactly 2 4's: 44x, 4x4, and x44.

-- One of them has exactly three 4's: 444.

-- None has more than three 4's.

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Q: How many strings of three decimal digits Have exactly digits that are 4?
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How many strings of three decimal digits begin with an odd digit?

There are 500 of 3-digit numbers begin with an odd one (100-199, 300-301, 500-599,700-799, and 900-999). In terms of "how many strings of", may filter or expand the above answer.


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