timiadriver18 timiadriver18

16-02-2017
Mathematics

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10 cards are numbered from 1 to 10 and placed in a box. One card is selected at random and is not replaced. Another card is then randomly selected. What is the probability of selecting two prime numbers?

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AnimeBrainly AnimeBrainly

16-02-2017

1st attempt: 4/10
2nd attempt: 4/9, or 3/9 if one is already founded

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