In how many of ways can 4 balls be placed in 4 tins if any number of balls can be placed in any tin?	Answers
A) 5C4
B) 5P4
C) 54
D) 4^4
E) 5^5
Now, each of the 4 different balls has 4 choices (4 tins to go to), so total # of distribution is 4*4*4*4=4^4.   Answer: 4^4.
<result>D</result>
In how many of ways can 4 balls be placed in 4 tins if any number of balls can be placed in any tin?