04,14,24,34,40,41,42,43,44,45,46,47,48,49,54,64,74,84,94.... OR 19 Digits
172
9 Digit
If the number can contain repeated digits, the answer is 800000. Without repetition, there are 483840.
874
8 digits
5. Count the number of digits from the first non-zero digit to the last non-zero digit.
A number is made up from digits in the numeral system. We often use the decimal system in which we use 10 digits, In writing the any number, many digits are used, even repitation of digits. when we write any number using the digits, the last digit ( from right side ) in that number is called unit digit. for example in the number 9814868980, here 0 is called unit digit.
10
The number of digits in a valid credit card can change depending upon the type of card. Mastercard and VISA use a 16 digit system, while others including American Express use a 15 digit system.
It will contain at least 12 digits
16 digit number