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Cards Marked with Numbers 1, 2, 3 ……… 20 Are Well Shuffled and a Card is Drawn at Random. What is the Probability that the Number on the Card Is: a Prime Number - ICSE Class 10 - Mathematics

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Question

Cards marked with numbers 1, 2, 3 ……… 20 are well shuffled and a card is drawn at random. What is the probability that the number on the card is:  

a prime number 

Solution

Total possible outcomes=20 

Favorable outcomes for a prime number= 2,3,5,7,11,13,17,19 

Number of favorable outcomes=8 

P(a prime number)= 8/20=2/5 

 

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Solution Cards Marked with Numbers 1, 2, 3 ……… 20 Are Well Shuffled and a Card is Drawn at Random. What is the Probability that the Number on the Card Is: a Prime Number Concept: Probability - A Theoretical Approach.
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