SOLUTION: How many 4 letter code words can be made using letters in the word pencil if repetitions are permitted? If repetitions are not permitted?

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Question 653822: How many 4 letter code words can be made using letters in the word pencil if repetitions are permitted? If repetitions are not permitted?
Found 2 solutions by lynnlo, MathTherapy:
Answer by lynnlo(4176) About Me  (Show Source):
You can put this solution on YOUR website!
pine,pile,nice,line

Answer by MathTherapy(10551) About Me  (Show Source):
You can put this solution on YOUR website!
How many 4 letter code words can be made using letters in the word pencil if repetitions are permitted? If repetitions are not permitted?

Repetitions permitted:
1st letter: 6 letter-choices
2nd letter: 6 letter-choices
3rd letter: 6 letter-choices
4th letter: 6 letter-choices

Amount of 4-letter codes with repetitions permitted: 6%5E4, or highlight_green%281296%29

Repetitions not permitted:
1st letter: 6 letter-choices
2nd letter: 5 letter-choices
3rd letter: 4 letter-choices
4th letter: 3 letter-choices

Amount of 4-letter codes with repetitions not permitted: _%5B6%5DP%5B4%5D, or 6 * 5 * 4 * 3 = highlight_green%28360%29

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