SOLUTION: Solve and please show work. Thank you! How many four-letter groups can be made with the letters A, B, C, and D if the letters <b>can</b> be repeated?

Question 37117: Solve and please show work. Thank you!
How many four-letter groups can be made with the letters A, B, C, and D if the letters can be repeated?
Answer by venugopalramana(3286) (Show Source): You can put this solution on YOUR website!
How many four-letter groups can be made with the letters A, B, C, and D if the letters can be repeated?
4 LETTER WORD....
I LETTER COULD BE ANY ONE OF 4 LETTERS A,B,C,D....SO ...4 WAYS.
II LETTER COULD BE ANY ONE OF 4 LETTERS A,B,C,D SINCE REPETETION IS ALLOWED....SO ...4 WAYS.
III LETTER COULD BE ANY ONE OF 4 LETTERS A,B,C,D SINCE REPETETION IS ALLOWED....SO ...4 WAYS.
IV LETTER COULD BE ANY ONE OF 4 LETTERS A,B,C,D SINCE REPETETION IS ALLOWED....SO ...4 WAYS.
HENCE NUMBER OF POSSIBILITIES =4*4*4*4=256
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