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1. Three cards are chosen at random from a standard deck of cards, without replacement. What is the probability that the first card is spades, the second card is hearts, and the third card is also spades?

 

2. Wu rolls two fair, six-sided dice. You are not told what the rolls were, but you are told that the sum of the two rolls is a prime. What is the probability that the sum of the two rolls is ?

 Feb 29, 2020
 #1
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+2

2 - Probability of a 2 = 1 / 36

     Probability of a 3  = 2 / 36

     Probability of a 5  = 4 / 36

The overall probability of getting a prime sum =1 / 36  +  2 / 36  +  4 / 36 =7 / 36

 Mar 1, 2020
 #2
avatar+31 
+1

I'm sorry, my formatting was wrong. On number two, the last sentence should be, "What is the probability that the sum of the two rolls is 5?"

You answer was wrong, but only because I wrote the question wrong. Sorry about that, but thank you very much for trying!

 Mar 1, 2020
 #3
avatar+108688 
+1

Since you have messed up this question it is probably best that you just re-ask properly.

Please just one question per post with a meaningful title. 

 Mar 2, 2020

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