987654321 is the highest nine-digit number with no repeated digits.
102 is the smallest three digit number with different digits.
Use the highest possible digit (9) for all 12 digits.
smallest 8 digit number with three different digits
9,999,876 is the greatest seven-digit number using four different digits.
9876 is the largest four digit number you can make if all the digits must be different.
Since there are only five different digits, a 6-digit number can only be generated if a digit can be repeated. If digits can be repeated, the smallest 6-digit number is 111111.
The largest 3 digit number whose digits are all primes is 777. The largest 3 digit number with different prime digits is 753.
Not necessarily. Consider 444. The digits are not different. The first and second digits are not multiples of 3 The first digit is not greater than the second digit. In spite of all that, 444 is a 3-digit number
Any two digit number in which: (a) the units digit is not 0, and (b) the two digits are different will form a new 2-digit number when the digits are interchanged.
Considering the lowest five digit hexadecimal number is 10000 (65,536) and the highest is FFFFF (1,048,575), there are 983,040 different hexadecimal numbers that are five digits.
5. The only even digit is 8, so that must be last. The remains 3 digits 5, 7, 9 form the largest number when the highest digit is in the highest place value, the next highest in the next highest place value and so on, ie 975, giving the four-digit even number 9758 with 5 in the tens place.
The tricky part is getting the individual digits. There are basically two ways to do this: 1) Convert the number to a string, and use string manipulation to get the individual digits. 2) Repeatedly divide the number by 10. The digit is the remainder (use the "%" operator). To actually get the highest digit, initially assume that the highest digit is zero (store this to a variable, called "maxDigit" or something similar). If you find a higher digit, replace maxDigit by that.