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| Math Central | Quandaries & Queries |
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Question from Breanna, a student: The code is made up of five two digit numbers from 01 to 20 entered in a certain order. How many different security codes are possible with this system |
Hi Breanna,
From the way you have described this you can repeat the two digit numbers, for example
15 06 15 15 06
is a valid security code.
Thus for each of the 5 two digit numbers there are 20 possibilities, any number from 01 to 20,
Can you complete the solution from here?
Penny
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