SOLUTION: Please help me solve this problem The door on the computer center has a lock which has six buttons numbered from 1 to 6. The combination of numbers that opens the lock is a sequ

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Question 274820: Please help me solve this problem
The door on the computer center has a lock which has six buttons numbered from 1 to 6. The combination of numbers that opens the lock is a sequence of four numbers and is reset every week.
(a)How many combinations are possible if a button can only be used once?
(b)How many combinations are possible if there is no restriction on the number of times a button can be used?
Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
No restrictions:
6*5*4*3=360 combinations.
6*6*6*6=1,296 combinations.