The jar contains 3+7+5=15 marbles in total.
We have to find the probability of the following events:
1. We choose a red marble from the jar that contains 15 marbles in total, 3 of them are red
2. We choose a blue marble from the jar that contains 15 marbles in total, 5 of them are blue
3. We choose a white marble from the jar that contains 15 marbles in total, 7 of them are white
The probability of the first event to happen is:
The probability of the second event to happen is:
The probability of the third event to happen is:
The probability of all three events to happen is: