a sequence of 4-digit number will me formed by using 1, 3, 4, 6, 7, and 8. how many numbers can be formed using different digits? (no repetition is allowed). how many odd numbers can be formed using different digits? (no repetition is allowed).

Respuesta :

2 of them
7 can be made by 4+3 2+5 1+6
3 1+2 3+0