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Earn +20 ptsQ: How many three-digit numbers contain only the digits 5 and 6?
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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 three digit numbers contain any odd digits?
874
How many numbers are there in a credit card number?
Most credit cards in the United States contain 16 digits broken into four groups of four digits. American Express cards contain 15 digits, however.
How many numbers is ten digits?
10 digits are numbers in the billions.
How many 4 digit numbers can you make with 10 digits?
Ten different digits can be used to make 10C4 = 10*9*8*7/(4*3*2*1) = 210 four-digit numbers. Either numbers starting with 0 are permitted or the 10 digits do not contain a 0.
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