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aalyn [17]
3 years ago
6

Answer not submitted

Mathematics
1 answer:
tensa zangetsu [6.8K]3 years ago
5 0
The customer drawing a 30% discount card then the next customer 20% discount card has a probability of 5/40 for the 30% which = 12.5% and  20% is 15/40 which = 37.5% add them together then divide by 2 for a total of 25%.

The customer drawing a 10% card has a 20/40 which = 50% then a customer drawing a 20% card is 15/40 = 37.5% add them together then divide by 2 = 43.75%

The customer drawing a 10% card has a 20/40 which is 50%.  Then another customer drawing another 10% is another 50% add them together and divide by 2 = 50%

The customer drawing a 20% card has a 5/40 which is 12.5% and another customer drawing a 20% card again is 12.5%.  Add together and divide by 2 = 12.5%.  So your answer is the 1st three.
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