Remember that probability is favorable outcomes divided by possible outcomes.Originally Posted bybatman123

1)4 Red and 6 Blue: There are 8 red he is chosing 4 thus there are different ways. There are 9 blue he is chosing 6 thus there are different ways. Thus there are a complete total of ways of chosing these types of cars. This is the favorable outcomes, now we find the possible outcomes. There are cars altogether and he is taking 10, thus there are different ways. Thus the probability is the ratio thus,

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Everything else is solved similarly.