2. Eight travelling agencies booked a tour to the United State. There are 25 major cities to...
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2. Eight travelling agencies booked a tour to the United State. There are 25 major cities to visit. What is the probability that at least two agencies start their tour from the same city?
4. An electronic store sales 60 computers in a month for $1200 each. The store found out that for every given %5 discount on computers, the sales go up by 5 more computers. What percentage discount will maximize the revenue?
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