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试卷名称:GRE（QUANTITATIVE）综合模拟试卷21

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Martha invited 4 friends to go with her to the movies. There are 120 different ways in which they can sit together in a row of 5 seats, one person per seat. In how many of those ways is Martha sitting in the middle seat?

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Martha invited 4 friends to go with her to the movies. There are 120 different ways in which they can sit together in a row of 5 seats, one person per seat. In how many of those ways is Martha sitting in the middle seat?

A talent contest has 8 contestants. Judges must award prizes for first, second, and third places, with no ties. (a)In how many different ways can the judges award the 3 prizes? (b)How many different groups of 3 people can get prizes?

In a box of 10 electrical parts, 2 are defective. (a)If you choose one part at random from the box, what is the probability that it is not defective? (b)If you choose two parts at random from the box, without replacement, what is the probability that both are defective?

In the figure below, AC = BC. Find the values of x and y. [*]

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