Posted by **peter** on Monday, June 28, 2010 at 2:15pm.

at a grand opening of a store, every 3rd person is given a balloon, and every 7th person is given a $5 coupon. if a person is selected at random from the first 100 people to shop there, whats the probability that the person will be given a balloon and a coupon?

how do you do this problem?

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