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There are 3 lucky tickets among 10 lottery tickets. 3 tickets are
drawn at random. What is a probability that one ticket selected randomly
from those three is lucky?


    You want WLL or LWL or LLW

    each has a prob of (3/10)(7/9)(6/8) = 7/40

    so prob is 3(7/40) = 21/40

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