Prime number event

Probability Level 1

A fair 20-sided die, numbered 1 through 20, is rolled.

Let R R be the event that a prime number is rolled.

R = ? R=\ ?

{ 2 , 3 , 5 , 7 , 11 , 13 , 17 , 19 } \{2,3,5,7,11,13,17,19\} { 1 , 3 , 5 , 7 , 9 , 11 , 13 , 15 , 17 , 19 } \{1,3,5,7,9,11,13,15,17,19\} { 1 , 2 , 3 , 5 , 7 , 11 , 13 , 17 , 19 } \{1,2,3,5,7,11,13,17,19\} { 2 , 3 , 5 } \{2,3,5\}

Andy Hayes by Andy Hayes , 38, USA

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2 solutions

Andy Hayes
May 31, 2016

Relevant wiki: Uniform Probability (by Outcomes)

The prime numbers between 1 and 20 (inclusive) are { 2 , 3 , 5 , 7 , 11 , 13 , 17 , 19 } \{2,3,5,7,11,13,17,19\} . Remember that 1 1 is not a prime number!

11 Helpful 0 Interesting 0 Brilliant 0 Confused

1 is nor prime nor a composite number. :( I have made it wrong better luck to me next time.

Abhishek Kumar - 3 years, 4 months ago
Sameer Salah
Jul 17, 2016
  1. And. 9. are not prime number
1 Helpful 0 Interesting 0 Brilliant 0 Confused

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