Question:
In a lottery of 50 tickets numbered 1 to 50, one ticket is drawn. Find the probability thatn the drawn ticket bears a prime number.
Solution:
GIVEN: Tickets are marked with one of the numbers 1 to 50. One ticket is drawn at random.
TO FIND: Probability of getting a prime number on the drawn ticket
Total number of tickets is 5.
Tickets marked prime number are 1,3,5,7,11,13,17,19,23,29,31,37,43,47,49
Total number of tickets marked prime is 15
We know that PROBABILITY = 
Hence probability of getting a prime number on the ticket is 