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You have 9 different posters: 4 art posters, 2 movie posters, and 3 travel posters. In how many ways can you give the posters to three friends if the first friend does not receive any travel posters?

 Mar 1, 2021
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How many ways are there to give 9 posters to 2 friends.

 

Poster 1 can go to Aor B   2 ways

Poster 2  can go to A or B 2 ways

..

Poster 9 can go to A or B 2 ways

 

2^9 in total

 Mar 1, 2021

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