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Q: 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  ?

  • 1
    16/19
  • 2
    1
  • 3
    3/2
  • 4
    17/20
  • Show Answer
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Answer : 4. "17/20"
Explanation :

Answer: D) 17/20 Explanation: n(S) = 20n(Even no) = 10 = n(E)n(Prime no) = 8 = n(P)P(E U P) = 10/20 + 8/20 - 1/20 = 17/20

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