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Un article trouvé pour ce sujet.
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Four digit phone numbers |
2014-02-25 |
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Tom pose la question :
Hi, I'm an online math teacher, working on lessons for my students.
This question is in their book and I can't do it...! Help!
It has to do with phone numbers, and in this problem,
we are only dealing with
the last 4 digits of the number.
It asks how many possible numbers we have
if at least one digit repeats in the last 4 digits of the number.
Penny Nom lui répond. |
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