infinite. not kidding.
* * * * *
Not kidding but NOT CORRECT either!
There are 10!/(5!*5!) combinations where n! = 1*2* ... *n
10*9*8*7*6/(5*4*3*2*1) = 252 combinations.
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6,720 combinations.
There is only one possible combination as a combination is the same no matter what the order is. There are 120 permutations, which is where the order does matter.
how many times gerater is the underlined digit 5 in 365,486,201 than the digit 5
There are 600 5-digit numbers divisible by 150.
There are 9000 of them.