# IB Math SL – Probability

**Q**uestions and **A**nswers

### 1. Probability – IB Mathematics SL – IB maths SL

How can we find the probability if A and B are two events such that , and ?

Solution

Probability – IB Mathematics SL – IB Maths SL

We know that

Finally, we have

### 2. Conditional Probability question – IB Mathematics SL – IB maths SL

How can we calculate the probability if A and B are two events such that , and ?

Solution

Conditional Probability question – IB Mathematics SL – IB maths SL

From conditional probability formula, we have that

Finally, we have that