Problema Solution
250 lockers each have a 4 digit combination using the digits 0 through 9 only once. for how many of these 4 digit combinations is the sum 6?
Answer provided by our tutors
24 ways.
Only combination of 0, 1, 2 and 3 make sum of 6 without repeatation.
So, 4!=4*3*2*1=24 ways