9000
9999-1000 equals 8999
if you add the 1 from 1000 you will get 9000
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16
Passwords are technically permutations, not combinations. There are 104 = 10000 of them and I regret that I do not have the time to list them. They are all the numbers from 0000 to 9999.
You can make 5 combinations of 1 number, 10 combinations of 2 numbers, 10 combinations of 3 numbers, 5 combinations of 4 numbers, and 1 combinations of 5 number. 31 in all.
There are 15 combinations.
There are 35C4 = 35*34*33*32/(4*3*2*1) = 52,360 combinations.