Question

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) 16/19 B) 1 C) 3/2 D) 17/20

Answer 1

Answer:

17/20

Step-by-step explanation:

10 even numbres and 7 prime numbers excluding 2

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Answer 2

QUESTION -

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 ?

ANSWER -

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