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7). (3 points) Seven friends went to an amusement park. Each wanted to ride the roller coaster with each of the others. If only 2 can ride the roller coaster together at one time, how many rides are needed so each can ride with all others once? Number of rides:______ 8). (3 points) 8 people go to a party. They all shake hands with each other. How many handshakes are there?Number of handshakes:______ 9). (3 points) How many 2-person teams can you make out of a basketball club that has 7 players?Number of teams:______ 10). (3 points)Skittles candy has 6 different colors. How many different color combinations can I pick if I select 2 candies and each of the 2 is a different color? Number of 2-candy combinations:______ |