24 4- digit number can be formed by using 1,3,5 and 7, with each digit being used exactly one each time. Find the average of these 24 numbers? 

From 4 letters ab18 one can make all 18 numbers with 4 digits. (In a number, each digit is written only once.) The sum of all 18 possible numbers is 90216. Find a and b.

Given 4 digits: 4, 6, 2, 0. 
What is the difference of the largest and the smallest 4-digit numbers that can be formed from these digits. Use each digit only ones.
Answer: The difference is 

How many different 3-digit whole numbers can be formed using the digits 4, 5, 0 and 8, assuming that no digit can be repeated in a number?

How many different 3-digit whole numbers can be formed using the digits 4, 5, 0 and 8, assuming that no digit can be repeated in a number?

using each of a digit 3,4,5 and 6 exactly once to form two 2 digit numbers .what is the different between the largest possible product and the smallest possible product of two such number

hơ many diferent 3- digit whole numbers can be formed using the digit 4,5 ,0 and 8 assuming that no digit can be repeated in a number ? ai nhanh tick

hơ many diferent 3- digit whole numbers can be formed using the digit 4,5 ,0 and 8 assuming that no digit can be repeated in a number ? ai nhanh tick

The average of two numbers is 86. One of these numbers is the greatest 2 – digit number. Find another number.