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 cds are possible?

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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step-by-step explanation: