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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?

  • math -

    IT must occur on the 21st, 42nd, 63rd, 84th persons.

    Pr= 4/100

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