When there is a finite number of possible outcomes and all are equally likely, it is relatively easy to find the probability of any event — the probability is simply the proportion of possible outcomes for which the event occurs.
The exercise below seems more complicated since it involves two items selected from a finite population. This can be done in two different ways, depending on whether the first item is replaced in the population before the second is selected. (When sampling without replacement, the same item cannot be selected twice.) However the different pairs that are 'legal' are all equally likely, so again we only need to find the proportion of these pairs for which the required event occurs.
Read the question below carefully. In particular, you must decide whether the two items are sampled with or without replacement — when sampling without replacement, the diagonal cells of the table are impossible and should be ignored when evaluating the probability.
Repeat with a few different questions.