【GRE考满分题库检索】GRE 题目搜索_等价和填空_阅读和逻辑_数学真题

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题目内容
When randomly selecting 2 balls out of a box of 6 red balls and 10 blue balls, what is the probability that 1 red ball and 1 blue ball are selected at the same time? fraction.
Select two numbers simultaneously from 1, 2, 3, 4, 5, what is the probability that the product of two numbers is odd? Give your answer as a fraction.
4 out of 10 people are majored in mathematics. If you want to choose a team of 3 people out of these 10 people, what is the probability that there are at least 2 mathematics professionals in this team?
From Room Number 100 -799, inclusive, the units digit of a double room is 5 or 6, the tens digit of a double-room is 6 or 7, when a room is randomly selected, what's the probability that it is a double room? Give your answer as a fraction.
There are 5 points on a number line, and two are on the left of 0, three are on the right of 0. If three numbers are chosen from those 5 points, what is the probability that all of them are positive integers? Give your answer as a fraction.
If Event X happens, it has five possible outcomes (A, B, C, D and E) in total. The probability that outcome A, B and D respectively occurs is listed as follows. If the probability that outcome C occurs is twice the probability that outcome E occurs, then what is the probability that outcome C occurs? Give your answer as a fraction.
When X and Y competes with each other (no ties), the probability that X wins is twice the probability that Y wins. What is the probability that Y wins for three consecutive times? Give your answer as a fraction.
The probability that event A occurs is p, and the probability that event A does not occurs is q. If p-q=0.2,what is the value of p? Give your answer as a decimal.
Consider two cubes with faces numbered 1 to 6 each, what is the probability that the first roll will be an odd number and the second roll will be a 5? Give your answer as afraction.
A fair coin is tossed several times. If the coin is getting a head for the first time. what is the probability of getting three heads on consecutive three tosses? Give your answer as a fraction.
There are 400 boys and 600 girls, 20% of boys and 23% of girls chose rock music. Now choose one boy and one girl, what is the probability that both of them like rock music? Give your answer as a percent. _____%
There are ten a and eight b, randomly select two letters without replacement, then what is the probability that the first letter is a and the second is b? Give your answer to the nearest 0.01 of a percent. ____%
Event A and event B are independent event. If the probability that event A occurs is 0.85 and the probability that event B occurs is 0.4,what is the probability that only event A occurs? Give your answer as a decimal.
There are 10 balls in a box, among which are 4 blue balls and 6 red balls. Randomly select three balls from them, what's the probability that all the three balls are blue? Give your answer as a fraction.
There are 5 red balls, 3 blue balls and 2 yellow balls in the first box. These balls are the same except that they are different in color. There are 8 red balls and 2 yellow balls in the second box. Randomly select one ball from each box, what is the probability at least one of the two balls is yellow?
There are five pairs of socks with different color each pair. When two socks are randomly selected, what's the probability that two socks of the same color are selected? Give your answer as a fraction.
In a box of 40 blues balls and 20 red balls, someone randomly selects balls twice without replacement. What is the probability that both balls are blue? Give your answer as a fraction.
Event A and event B are independent. the probability that event A occurs is 0.85 and B occurs is 0.9 Quantity A The probability that neither A nor B occurs Quantity B 0.25
The probability of event A is 0.5, the probability of event B is 0.3, what is the greatest probability that neither of the two events occur?
The probability that event A occurs is 0.6, and the probability that event B occurs is 0.8,which of the following could be the probability that both A and B occurs? Indicate all such statements.

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