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This is one of my study guide questions and I need a little help

Suppose that in a class of 500 students 210 smoke, 258 drink, 216 snack, 122 smoke and drink, 83 snack and drink, 97 smoke and snack, and 52 do all three. What is the probability that a student:

(a) smokes but doesn't not drink

(b) snacks and drinks, but doesn't smoke

(c) neither smokes or drinks

2. Relevant equations

3. The attempt at a solution

Sm=smokes

D=drinks

Sn=snacks

(a) Prob(Sm [itex]\cap[/itex] ~D) = P(Sm)-P(Sm[itex]\cap[/itex]D = (210/500)-??

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# Probability question?

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