There are 15 homerooms in the school and 20 students in each homeroom. If the principal selects 5 of the homerooms for a pizza party, what is the probability of Mr. Smith's homeroom being selected?

• No. of ways for selecting 5 homerooms out of 15 = 15C5
  No. of ways in which Mr. Smith's homeroom wont get selected = 14C5
  Probability of not selecting Mr. Smith's homeroom = 14C5/15C5 = 14/15
  Therefor probability of Mr. Smith's homeroom being selected = 1 - 14/15 = 1/15
• 11 years agoHelpfull: Yes(7) No(5)
• 515 *1/5=1/15
• 11 years agoHelpfull: Yes(0) No(3)