In a box there are 7 red spheres and 12 blue spheres 2


In a box there are 7 red spheres and 12 blue spheres. 2 spheres are taken without return. If the third sphere is red, what is the probability that 2 first spheres are blue ?

 

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Mathematics: In a box there are 7 red spheres and 12 blue spheres 2
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