Playing cards

From 32 playing cards containing 8 red cards, we choose 4 cards. What is the probability that just 2 will be red?

Correct result:

p =  0.2109

Solution:

q=832=14=0.25  C2(4)=(42)=4!2!(42)!=4321=6  p=(42) q2 (1q)2=6 0.252 (10.25)2=27128=0.2109



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