a bag has 1 yellow marble, 6 blue, and 2 pink. if 2 marbles are randomly chosen from the bag, how many different color combinations are there?

Question

this question is 7th grade probability 

Answer 1

If there is a "first" marble and there is a "second" marble (note: there is only 1 yellow).

 

The combinations are:

    first   second

    ----   --------

      Y       B

      Y       P

      B       Y

      B       B

      B       P

      P       Y

      P       B

      P       P

 

There are 8 combinations.

 

Now, if there is not a "first" marble and a "second" marble, how many combinations are there?  (that is, position doesn't matter:  Y-B is the same as B-Y) ??