1000

How Many 4 Digit Combination You Can Make Using Digits 1,2,3,4,5, without repeating the same number??

The given numbers are 1, 2, 3, 4, 5, 6, 7, 8, 9. The total number of digits is 9.The number of four digit numbers can be calculated by using rule of combination.

number of four digit numbers =

number of four digit numbers = 9!/ 4!(9-4)!

number of four digit numbers = 9!/ 4!*5!

number of four digit numbers = 126

number of four digit numbers =

^{9}C_{4}number of four digit numbers = 9!/ 4!(9-4)!

number of four digit numbers = 9!/ 4!*5!

number of four digit numbers = 126

10000

How many 4 to 5 digit combinations can you make using digits 1,2,3,4,5,6,7,8,9,0