Answer:
(a)

(b)
i.


ii.


iii.


Step-by-step explanation:
Given



Solving (a): List all possible elements using set-roster notation.
The possible elements are:

And the number of elements are:

Solving (bi) Exactly 1 girl
From the list of possible elements, we have:

And the number of the list is;

The probability is calculated as;



Solving (bi) At least 2 are girls
From the list of possible elements, we have:

And the number of the list is;

The probability is calculated as;



Solving (biii) No girl
From the list of possible elements, we have:

And the number of the list is;

The probability is calculated as;


