In a class of 45 students, 28 offer chemistry and 25 offe...
In a class of 45 students, 28 offer chemistry and 25 offer Biology. If each student offers at least one of the two subjects, calculate the probability that a student selected at random from the class the class offers chemistry only.
A.
29
B.
49
C.
59
D.
79
Correct answer is B
28 - x + x + 25 - x = 45
53 - x = 45
x = 53 - 45
x = 8
chemistry only = 28 - 8
= 20
Probability = 2045
= 49
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