2 adults and 5 children are going for a ride in a minivan with 2 front seats, 2 middle seats, and 3 back seats. If the adults sit in the front seats, how many different ways are there to choose which 2 of the 5 children sit in the middle seats?

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10 people visit a buffet. The buffet has 5 dishes, and each person orders a 2-dish combo. Is it possible for each of the 10 people to choose a different pair of dishes?

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2 adults and 5 children are going for a ride in a minivan with 2 front seats, 2 middle seats, and 3 back seats. If the adults sit in the front seats, how many different ways are there to choose which 3 of the 5 children sit in the back seats?

Excel in math and science

Master concepts by solving fun, challenging problems.

It's hard to learn from lectures and videos

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