In how many ways can a person post 5 letters in 4 letter boxes ?	Choose the correct choice:
A) 480	B) 1024	C) 54	D) 4^5	E) 5^5
There are 4 places (ABCD) that need to be filled.   Letter 1 can be posted in either A, B, C, or D i.e. 4 ways   Letter 2 can be posted in either A, B, C, or D i.e. 4 ways   Letter 3 can be posted in either A, B, C, or D i.e. 4 ways   Letter 4 can be posted in either A, B, C, or D i.e. 4 ways   Letter 5 can be posted in either A, B, C, or D i.e. 4 ways   So the total no of ways in which 5 letters can be posted in 4 boxes are = 4 x 4 x 4 x 4 x 4 = 4 ^ 5   Thus the answer is 4^5
<result>D</result>
In how many ways can a person post 5 letters in 4 letter boxes ?