Hello, crazydeo!

Good question!

Q: Find the probability of a couple's fourth child is a girl,

given that their first 3 children are girls.

A: I think the answer is 0.5, because regardless of the situation,

the probability will always be 0.5, as each event is independent.

How can I solve this problem in terms of: .

We want: .

The numerator is: .

The denominator is: .

Therefore: .