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There are 5 students in my class. I want to pick 2 to treat them to...

There are 5 students in my class. I want to pick 2 to treat them to a lunch. The 1st picked gets 100% lunch cost covered and the 2nd picked gets 50% of the lunch cost covered. In how many ways can I do this?

10

5

20

2

Math   Statistics-And-Probability   
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TOPIC:Permutation and Combination.

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