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Earn +20 ptsQ: How many numbers contain a 3?
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Continue Learning about Math & Arithmetic
How many numbers between 1 and 100 contain a 3?
19 whole numbers, and infinitely many fractions and decimals
How many 7 digits telephone numbers are there that begin with 123 and that contain 3 or 7?
Since the numbers begin with 123, they all contain a 3. As a result, they all "contain 3 or 7". So the remaining 4 digits can be any digits and this gives 104 = 10,000 such numbers.
How many 3 digit numbers are there that contain at least 1 seven?
252
How many 3 digit numbers contain just one 7?
234
How many 3 digit numbers contain the digit 2 at least once?
252
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