+0  
 
0
101
2
avatar+554 

How many 3-letter words can we make from the letters A, B, C, and D, if we are allowed to repeat letters, and we must use the letter A at least once?

 Oct 9, 2018
 #1
avatar+96067 
+2

A B C   =  3!   = 6

A B D  =   3!  = 6

A C D  =   3!  = 6

A B B  =  3! / 2!  = 3

A C C  =  3! / 2!  = 3

A D D  =  3! / 2!  = 3

 

A A B  = 3

A A C  =  3

A A D  = 3

 

A A A  = 1

 

So....I get   37

 

Anyone get something different  ???

 

 

cool cool cool

 Oct 9, 2018

40 Online Users

avatar

New Privacy Policy

We use cookies to personalise content and advertisements and to analyse access to our website. Furthermore, our partners for online advertising receive information about your use of our website.
For more information: our cookie policy and privacy policy.