+0  
 
0
61
2
avatar+4690 

Help 10

 Dec 4, 2018
 #1
avatar+137 
+1

Here is me trying:

 

There are 6 letters, right? All of them are different. You make a tree diagram or a chart.

 

There are this many: FA, FB, FR, FI, FC, AF, AB, AR, AI, AC, BF, BA, BR, BI, BC, RF, RA, RB, RI, RC, IF, IA, IB, IR, IC, CF, CA, CB, CR, CI.

 

That is if the same letter cannot be used twice within one permutation. If that can happen, then add 6 to the number.

 

My answer: 30

 

winksmileylaugh

 Dec 4, 2018
 #2
avatar+94545 
+1

P(6,2)  = 30

 

 

Good Job, Tanmai......!!!!!

 

 

 

cool cool cool

 Dec 4, 2018

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