15) In a graduating class of 100 students, 65 will study mathematics, 70 will study physics, and 40 will study both mathematics and physics. If one of these students is selected at random, find the probability that the student will study physics but NOT mathematics.
A) 3/10
B) 9/20
C) 1/20
D)1/4
Answers & Comments
Answer:
a) 3/10
Step-by-step explanation:
Since 70 students will study mathematics and 40 will study both mathematics and physics, you need to subtract 70 - 40 = 30.
100 students in a graduating class
70 - 40 = 30
= 30/100
= 3/10