Question

In a class of 25 students, 15 of them have a cat,

16 of them have a dog and 3 of them have neither.
Find the probability that a student chosen at random
has a cat and a dog.
You may wish to complete the Venn diagram to help you.
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Answer 1

Explanation:

if 15 of them have a cat 10 is left but 16 have a dog so that means 6 people have the same and 3 people are left without a person hopes this helps

Answer 2

9/25

Explanation:

• we first find how many have both, let x represent this group
• so all together there should be 25 students so we say
• 
  `25students=(16-x)students+(15-x)students+(x)students+3students\\x=9students`
• The probability is then 9/25