Question

An examination consists of 3 sections:
Section A has 4 questions
Section B has 5 questions
Section C has 6 questions

1) If students are required to answer 9 questions from any section, how many different combinations of 9 questions are possible?

2) If students are required to answer three questions from each section, how many different combination of 9 questions are possible?

Answer 1

I tried to answer but not sure
1) C(15, 9) = 5005
2) C(4, 3) x C(5, 3) x C(6, 3) = 800

Answer 2

Use combinations here.

Answer 3

Those answers are correct.

Answer 4

Yeah, thx wio

Answer 5

We're assuming it's exactly 9 questions fortunately.