SOLUTION: Use either the fundamental counting principle or the permutation formulas (or both) to answer the following: How many different two-digit numbers can be formed from the digits 3

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Question 146036: Use either the fundamental counting principle or the permutation formulas (or both) to answer the following:
How many different two-digit numbers can be formed from the digits 3, 1, 4, and 5 (allowing reuse)?



Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
4 ways to pick the 1st digit
4 ways to pick the 2nd digit
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Total # of ways = 16
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Cheers,
Stan H.