Counting Principles - Combinations and Permutations

Mathematics
Tutor: None Selected Time limit: 1 Day

To log into your smart phone, a four-digit code must be entered. The code must use the digits 0 through 9 or upper case letters A through D. If digits and number can be repeated, how many four-digit codes can be created?

May 21st, 2015

Answer:
P(n,r) =
P(14,4) =
14! / (14 - 4)! =24024

May 21st, 2015

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