Tickets numbered 1 to 20 are mixed up and then a ticket is drawn at random. What is the probability that the ticket drawn has a number which is a multiple of 3 or 5?
a)1/2
b)2/5
c)8/15
d)9/20

• 
  d)9/20
  
  the probability that the ticket drawn has a number which is a multiple of 3 or 5 = 9/20
  
  as 9 favorable nos out of 20 numbers are 3,5,6,9,10,12,15,18,20.
• 12 years agoHelpfull: Yes(9) No(1)
• as in question,there is mention that the ticket drawn has a number which is multiple of 3 or 5..which means that the number either multiple of 3 or 5.. but 15 is multiple of both...
  so , from the nos-{3,6,9,12,15,18,5,10,20} ,15 should be discarded, after discarding 15 then the actual answer will be- (B.) 2/5
• 11 years agoHelpfull: Yes(5) No(5)
• the numbers from 1 to 20 divided by 3 is 3,6,9,12,15,18 and the numbers divided by 5 is 5,10,15,20
  so the probability is 6/20+4/20 -1/20=9/20
  -1/20 because 15 calculated for twice
  Answer 9/20
• 6 years agoHelpfull: Yes(0) No(0)
• Probability of number multiple of 3=6/20=3/10
  Probability of number multiple of 5=4/20=1/5
  Now,
  Probability number multiple of 3 or 5=3/10+1/5=1/2
  Therefore Answer is 1/2
• 6 years agoHelpfull: Yes(0) No(0)