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【数学 猴哥难题-39】
144人已做
75%正确率
Sixty-eight people are sitting in 20 cars and each car contains at most 4 people. What is the maximum possible number of cars that could contain exactly 1 of the 68 people.
【数学 猴哥难题-40】
120人已做
72%正确率
If n is any prime number greater than 2, which of the following CANNOT be a prime number
【数学 猴哥难题-41】
126人已做
73%正确率
How many integers between 101 and 201 are equal to the square of some integer?
【数学 猴哥难题-42】
132人已做
74%正确率
The “reflection” of a positive integer is obtained by reversing its digits. For example, 321 is the reflection of 123. The difference between a five-digit integer and its reflection must be divisible by which of the following?
【数学 OG-43】
138人已做
75%正确率
A box contains 6 black balls and 4 white balls. If two balls are selected at random without replacement, what is the probability that both balls are white?
【数学 OG-44】
144人已做
72%正确率
The probability that event A occurs is 0.4, and the probability that events A and B both occur is 0.25. If the probability that either event A or event B occurs is 0.6, what is the probability that event B will occur?
【数学 magoosh-45】
150人已做
73%正确率
If four numbers are randomly selected without replacement from set {1, 2, 3, 4}, what is the probability that the four numbers are selected in ascending order?
【数学 magoosh-46】
156人已做
74%正确率
Each circle has center O. The radius of the smaller circle is 2 and the radius of the larger circle is 6. If a point is selected at random from the larger circular region, what is the probability that the point will lie in the shaded region?
【数学 magoosh-47】
162人已做
49%正确率
Set A: {1, 3, 4, 6, 9, 12, 15} If three numbers are randomly selected from set A without replacement, what is the probability that the sum of the three numbers is divisible by 3?
【数学 magoosh-48】
168人已做
50%正确率
A box contains 4 red chips and 2 blue chips. If two chips are selected at random without replacement, what is the probability that the chips are different colors?
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