greatbrit54 greatbrit54

06-06-2018
Mathematics

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We have 9 cards numbered 1 to 9. Two cards are drawn at random. What is the probability that the sum of the drawn cards is a prime number less than 9

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Uknowwhomath Uknowwhomath

18-06-2018

There are 5 cards less than nine that are prime, so there is a 5/9 chance of picking the first one prime. The second one would be 4/8 or 1/2, because you have removed a card from the deck. You multiply them together to get: 5/18.

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