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In a class of 50 pupils, 35 like Science and 30 like Hist...

In a class of 50 pupils, 35 like Science and 30 like History. What is the probability of selecting a pupil who likes both Science and History?

A.

0.10

B.

0.30

C.

0.60

D.

0.70

Correct answer is B

Let the number of students that like both Science and History = x

Number of Science only = 35 - x

Number of History only = 30 - x

35 - x + 30 - x + x = 50

65 - x = 50

x = 15

P(Science and History) = 1550=0.30