Question 706401
There are 4! = 4*3*2*1 = 24 ways to arrange the letters of the name "mark"


There are 5! = 5*4*3*2*1 = 120 ways to arrange the digits: 8, 2, 1, 7, 3


So there are 24*120 = 2,880 different passwords


This may sound like a lot, but to a computer this is nothing. A computer can try thousands of passwords a second. So Mark is better off using all the letters of the alphabet (both lower and upper case) along with all ten numeral digits to get a really safe password.