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I need help

 Jun 22, 2018
 #1
avatar+202 
+2

So 3 have no pets, so 25 - 3 = 22 students have a pet.  There are 15 cats and 16 dogs so 15 + 16 = 31.  And then 31 - 22 = 9. The 9 means that 9 students have both pets.  So the probability is 9/25.

 Jun 22, 2018
 #2
avatar+7350 
+1

 

The probability that a student chosen at random has a cat and a dog   =   9 / 25

 Jun 22, 2018

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