A radio station runs a promotion at an auto show with a money box with

Question

A radio station runs a promotion at an auto show with a money box with 14
?$100
?tickets, 11
?$50
?tickets, and 12
?$25
tickets. The box contains an additional 20
?"dummy" tickets with no value. Find the probability that three ?$100
prizes are chosen.

Answer 1

Total amount of tickets is 57

 

step 1= 14/57+ 13/56 + 12/55 because each time that a ticket is pulled it reduces the total amount of tickets to be pulled one less.

 

step 2= .25+.23+.22= .70

 

step 3: probability is 7/10

 

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