89
Only one.
There are only 10 combinations. In each combination one of the 10 digits is left out.
There are only five combinations: 1234, 1235, 1245, 1345 and 2345.
There is only one combination. There are many permutations, though.
It depends. If you can only use each number once, there are 720 combinations. If you can use numbers multiple times, then there are 1000 combinations, by using all numbers from 000 to 999.
I think that stairs is alot of steps together and steps are only a few in numbers. Also it could be that stairs are inside and steps are outside.
there are between 1665 steps to 1710 steps all the way to the top depending on which side you try..... the problem is that you can only climb by stairs up to the second floor....from thesecond floor to the top, its forbidden to use the stairs and you have to take the lift (for safety reasons)
Only if those stairs are quite shallow and the length of the steps are much longer than what is standard for humans to climb and descend.
Two make combinations you would take 2x1=2 combinations only
First you try to solve it, but you will soon realize that there is only two steps. Guess and Check.
You need to specify how many characters, form the eight, are to be in the combinations. For example, there is only 1 combination of 8 characters.
There are only four combinations but there are 8 permutations.
Only one.
Only one.
There are only five combinations: 1234, 1235, 1245, 1345 and 2345.
There are only 10 combinations. In each combination one of the 10 digits is left out.
The answer is 31C5 = 31!/[26!5!] = 169,911