How many different 4 letter combinations can be created from the letters M,N,O, and P?	Choose the correct choice from the following answers
A) 4 B) 16 C) 32 D) 96 E) 256
This is a case of number of arrangements possible with repetition.   Thus you have 4 options each for the 1st,2nd,3rd and 4th letter giving you a total of   4*4*4*4= 
<gadget id="calculator">  4*4*4*4</gadget>
<output>256</output>
256 number of possible combinations.   Answer : 256
<result>E</result>
How many different 4 letter combinations can be created from the letters M,N,O, and P?