Pangolin14

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 #1
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This is similar to the following question: https://web2.0calc.com/questions/if-three-straws-are-chosen-at-random-from-a-set-of-9-straws

 

The total number of ways to pick the 3 straws = $8 \choose {3}$  $ = 56,$ so the total is 56. See if you can find the favorable on your own :)

28 oct 2020