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Ms. Q gave Grogg the following problem: "License plates consist of six upper-case letters. For example, two possible license plates are $ABCDEF$ and $AAAPOS.$ No two license plates are the same. How many possible license plates are there which contain at least four $A$'s?"

 Mar 1, 2021
 #1
avatar+31281 
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*** error ****   deleted     See Chris answer below...... I was looking for the link when he posted it !

 Mar 1, 2021
edited by ElectricPavlov  Mar 1, 2021
edited by ElectricPavlov  Mar 1, 2021
 #2
avatar+118069 
+1

Here :    https://web2.0calc.com/questions/ep-melody-cphil-please-come

 

 

cool cool cool

 Mar 1, 2021

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