Assuming the first 2 rows have been selected, how many ways are there to choose the 2
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Assuming the first 2 rows have been selected, how many ways are there to choose the 2 people in the back row?
You and 5 of your friends are at an amusement park, and are about to ride a roller coaster. The cars have room for 6 people arranged in 3 rows of 2 , so you and your friends will perfectly fill one car.
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