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6
It will contain at least 12 digits
04,14,24,34,40,41,42,43,44,45,46,47,48,49,54,64,74,84,94.... OR 19 Digits
Most credit cards in the United States contain 16 digits broken into four groups of four digits. American Express cards contain 15 digits, however.
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.
6
Yes. Names can contain letters, digits, and spaces, as well as most of the punctuation symbols.
It will contain at least 12 digits
04,14,24,34,40,41,42,43,44,45,46,47,48,49,54,64,74,84,94.... OR 19 Digits
Most credit cards in the United States contain 16 digits broken into four groups of four digits. American Express cards contain 15 digits, however.
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.
no, it matters with the number not digits
How many strings of three digits are there? 000 to 999, or a total of 1000. How many strings of three digits contain the same three digits? That's 000, 111, 222 ... 999! ten in total. The difference is your answer: 1000-10 = 990.
A serious load of zeros.
California inmate ID numbers contain six digits.
A digit is a finger or toe. Digits contain joints (for example, knuckles) but are not joints themselves.
9 Digit