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An airline is given permission to fly $4$ new routes of its choice. The airline is considering $12$ new routes: $4$ routes in Florida, $5$ routes in California, and $3$ routes in Texas. If the airline selects the $4$ new routes at random from the $12$ possibilities, determine the probability that:

a) $2$ are in Florida and $2$ are in Texas

b) $3$ are in California and $1$ is in Florida

c) $1$ is in Florida, $1$ is in California, and $2$ are in Texas

d) at least one is in Texas.

Please can someone help me with this question?

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    Welcome to math.SE: since you are new, I wanted to let you know a few things about the site. In order to get the best possible answers, it is helpful if you say in what context you encountered the problem, and what your thoughts on it are; this will prevent people from telling you things you already know, and help them give their answers at the right level.2012-12-15

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