Tips

Question 1

Tip:

Remember that how you define S, it might help you to use some tools rather than others.

Answer 1

Example:

6 Green and 4 Red marbles:

S = {R,G}

OR

S={1,2,3,4,5,6,7,8,9,10}

where numbers 1-4 are red and 5-10 are green.

Question 2

Tip:

How to find P(A inter B)

Answer 2

1. A and B are disjoint so P(A inter B) = 0
2. A and B are independent P(A inter B) = P(A) P(B)
3. A and B are dependent and you know P(A|B) or P(B|A) P(A inter​ B) = P(A|B) P(B) or P(A inter​ B) = P(B|A) P(A)

Question 3

Tip: Sampling without replacement

Then the events are dependent