8+9-1-2-3=11
1. The numbers 1 through 99 are 99 different numbers; each one occurs once.
998,000
Assuming each number can be used more than once.... 2401 possible combinations.
it cant
200,205, 10
1. The numbers 1 through 99 are 99 different numbers; each one occurs once.
998,000
1346
120, if you use each number once.
24 = 7 * 8 / 2 - 4
There are 10,000 possible combinations, if each number can be used more than once.
Assuming each number can be used more than once.... 2401 possible combinations.
Choose from 4 for the first number, 3 for the second number, and 2 for the third number. Therefore there are 4*3*2 = 24 three digit numbers can be formed from 3769 if each digit is used only once.
720 assuming that each number can be used only once.
dude its 8
it cant
6*5*4*3=360