In a class of 30 students, 15 students took a mathematics exam, 10 students took a biology exam and 4 students took both exams. A student is selected at random. What is the probability that the student did not take either of the exams? Give an exact answer either as a decimal or as a fraction in fully simplified form.

A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
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Chapter1: Combinatorial Analysis
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Question 4
In a class of 30 students, 15 students took a mathematics exam, 10 students took a
biology exam and 4 students took both exams.
A student is selected at random. What is the probability that the student did not take
either of the exams? Give an exact answer either as a decimal or as a fraction in fully
simplified form.
Transcribed Image Text:Question 4 In a class of 30 students, 15 students took a mathematics exam, 10 students took a biology exam and 4 students took both exams. A student is selected at random. What is the probability that the student did not take either of the exams? Give an exact answer either as a decimal or as a fraction in fully simplified form.
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