Call the digits 'A' and 'B', so that the number is written: AB.
10A + B = 4 (A+B)
10A + B = 4A + 4B
6A = 3B
2A = B ---> any 2-digit number where the units digit is twice the tens digit
12 or 24 or 36 or 48
To form a four-digit number using the digits 0, 1, 2, 3, 5, 6, and 7, we must ensure that the first digit is not 0 (to avoid creating a three-digit number). This leaves us with 6 options for the first digit (1, 2, 3, 5, 6, 7). For the remaining three digits, we can use any of the 7 digits (including 0) and can repeat digits. Thus, the total number of four-digit numbers is calculated as follows: (6 \times 7 \times 7 \times 7 = 6 \times 343 = 2058). Therefore, there are 2058 possible four-digit numbers.
9,999,876 is the greatest seven-digit number using four different digits.
The greatest 4-digit number with no repeated digits is... 9876
9876 is the largest four digit number you can make if all the digits must be different.
There is no such number. If the four digits are even, the entire number is even, not odd.
2178 * 4 = 8712
9,999,876 is the greatest seven-digit number using four different digits.
The greatest 4-digit number with no repeated digits is... 9876
The number is 36
9876 is the largest four digit number you can make if all the digits must be different.
Find a four digit number whose digits will be reversed when multiplied by nine?
There is no such number. If the four digits are even, the entire number is even, not odd.
this question doesnt make sense
It looks like you're asking what is the largest 4-digit number which has four 4's for digits - with a four digit number using four 4's, there is only one such number: 4444. Maybe I'm not understanding the wording of your question.
To form a four-digit number using the digits 1, 2, 3, 4, 5, and 6 without repeating any digits, you can choose the first digit in 6 ways, the second digit in 5 ways, the third digit in 4 ways, and the fourth digit in 3 ways. Therefore, the total number of four-digit combinations is calculated as (6 \times 5 \times 4 \times 3 = 360). Thus, 360 different four-digit numbers can be formed.
1023
1023