1st digit: 7,8
other digits: 5 choices each
so, for each of those 10 combinations, how many numbers between 70,000 and 1,000,000,000 ?
How many possible numbers are between 1 and 1000000000 that are greater than 72000 if we only use the following digits (4, 5, 6, 7, 8)
1 answer