Question: Tammy has 31 students in her Math 15 class. She is going to pick three students randomly and give them extra credit. How many ways

Tammy has 31 students in her Math 15 class. She is going to pick three students randomly and give them extra credit. How many ways can she do this if:

a. She will give all three students 10 points extra credit.

b. She will give one student 20 points extra credit, one student 10 points extra credit and one student 5 points extra credit

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