SOLUTION: determine the number of ways that two letters can be selected from {a b c d} if order in the sample is not to be considered. list the possible samples

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Question 163575: determine the number of ways that two letters can be selected from {a b c d} if order in the sample is not to be considered. list the possible samples
Answer by checkley77(12569) About Me  (Show Source):
You can put this solution on YOUR website!
a,b,c,d
[aa,bb,cc,dd]
ab,ba,ac,ca
ad,da,bc,cb
bd,db,cd,dc
Answer is 16 with repeats.
Answer is 12 without repeats.