Permutations
 

Permutations problem 33


We make new numbers from the digits of the number 9759279.


  • How many such numbers can we compose?


  • How many such numbers end with three nines?


  • How many such numbers start with the digit 7 and end with the digit 9?


  • How many such numbers end with two identical digits?


 

material editor: Theophilus Borgbara