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Earn +20 ptsQ: How many 2 digit numbers contain the digit 4?
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How many a 2 -digit numbers contain the digit 4?
-2
How many 2-digit numbers contain the digit 7 only once?
-5
How many 2-digit numbers contain the digit?
It would help to know which digit. 0 appears in 9 numbers and each of the others in 18 numbers.
How many 3 digit numbers contain the digit 2 at least once?
252
How many whole numbers between 100 and 400 contain the digit 2 in their standard notation?
The answer is 138
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