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Out of first 20 natural numbers, one number is selected at random. The probability that it is either an even number or a prime number is?

A.1/2
B.16/19
C.4/5
D.17/20
Answer and Feedback
Answer:D
Feedback:n(S) = 20
n(Even no) = 10 = n(E)
n(Prime no) = 8 = n(P)
P(EᴜP) = 10/20 + 8/20 - 1/20 = 17/20.

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Practice probability Online Test 1 | Englishfreetest.com

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