The sum of all digit is 21 none of my digit are same.i am the smallest 7 digit number made of these digit who I am?
123,456
6,7,8
To find the smallest 7-digit number that meets the given conditions (sum of all digits is 21 and none of the digits are the same), we can follow these steps:
1. Start by finding the smallest possible digit for the leftmost position of the number. Since the number must be the smallest possible, this digit should be the smallest possible non-zero digit, which is 1.
2. Subtract the value of the digit chosen in step 1 (1) from the total sum of the digits (21) to find the remaining sum of the other digits. In this case, it would be 21 - 1 = 20.
3. Starting from the leftmost position, continue to find the next smallest digit that does not exceed the remaining sum (20). In this case, the next smallest digit would be 9 since it doesn't exceed 20.
4. Subtract the value of the digit chosen in step 3 (9) from the remaining sum (20) to find the new remaining sum. In this case, it would be 20 - 9 = 11.
5. Repeat steps 3 and 4 until all digits have been determined. Continuing this process, the digits from left to right would be: 1, 9, 8, 3, 0, 0, 0.
Thus, the smallest 7-digit number that meets the given conditions (sum of all digits is 21 and none of the digits are the same) is 1983000.