Manuel has 6 CDs that he is going to give away. He lets his best friend choose 3 of the 6 CDs. How many different groups of 3 CD
s are possible?
1 answer:
Answer:
20 groups
Step-by-step explanation:
The number of different groups possible to choose from would be the combination because order doesn't matter.
Ways of choosing r things from n total things in combination is given by:

Where
n ! = n * (n-1) * (n-2) * ....
So here we use
n = 6
r = 3
substituting in formula we get:

So, 20 groups are possible
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