Answer:

Explanation:
In probability "AND" means "MULTIPLICATION" and "OR" means "ADDITION".
We want probability of Jennie AND Alex both getting free tickets.
Thus, we need to multiply individual probabilities.
There are total 20 people and 10 tickets, so chances of getting a ticket is 10/20 = 1/2
P(Jennie gets ticket) = 1/2
P(Alex gets ticket) = 1/2
P(Jennie and Alex get ticket) = 1/2 * 1/2 = 1/4 = 0.25