#### 题目列表

In how many different ways can 3 identical green shirts and 3 identical red shirts be distributed among 6 children such that each child receives a shirt?
The 8 items A, B, C, D, E, F, G, and H are to be displayed on a straight line. In how many ways can the items be displayed if item B must be placed in any position that is to the right of item A, and item C must be placed in any position that is to the right of B?
If one number is chosen at random from the first 1,000 positive integers, what is the probability that the number chosen is a multiple of both 2 and 8?
What is the probability of selecting two socks of the same color when selecting two socks out of 5 pairs of different colors of socks (each pair of socks have the same color)?
A box contains 6 cards, numbered 1, 2, 3, 4, 5, and 6, respectively. If one of the 6 cards is to be selected at random, what is the probability that the number on the card selected will be greater than 3, or even, or both?
If all the digits of a three-digit integer are divisible by 3, then what is the probability that the tens digit of the integer is an odd number while the hundreds digit is an even number?
In a group of 10 employees, 4 are good at computer. If 3 employees are randomly selected from the group, what is the probability that at least 2 employees selected are good at computer?
Set={2, 3, 5, 6, 9, 10}
When selecting two different numbers from the set, what is the probability that the product of the two selected numbers is less than 50?
What is the probability that the tens digit of the selected number is even when randomly selecting a number from all the two-digit odd integers?
What is the probability that the number is more than 3,000 when forming four-digit integers out of 1, 2, 3 and 4 (no repeated number can be used)?
If two numbers are randomly selected from positive integers from 1 to 10 such that no number is selected twice, what is the probability that the difference of the two selected numbers is 1?
If 9 out of 15 dancing programmes are new, then what`s the probability that the two programmes randomly selected from them are both new ones?
Of the 20 lightbulbs in a box, 2 are defective. An inspector will select 2 lightbulbs simultaneously and at random from the box. What is the probability that neither of the lightbulbs selected will be defective?
Of the ten lightbulbs in a box, two are defective. An inspector will select two lightbulbs simultaneously and at random from the box. What is the probability that neither of the lightbulbs selected will be defective?
What is the probability that someone randomly selects a number from 100 to 159 inclusive such that the tens digit of the selected number is no more than 3 and the units digit of the selected number is no more than 4?
A committee has to choose four out of ten companies ($C_1$ and $C_2$ included) for the annual award. What is the probability that $C_1$ and $C_2$ are both selected?
What is the probability that A and B are both selected when you select 40 people out of a group of 100 (A and B included)?

Several 0 and 1 are arranged in a 10*10 palace as follows. Among all the number 0, what is the probability that they are arranged in both an odd row and an odd column?
In a bag, only red and blue balls (at least 2 balls for each color) are included.

#### Quantity A

The probability that red ball is selected when you add a blue ball from the box

#### Quantity B

The probability that red ball is selected when you remove a red ball from the box

Mark flips 2 dimes (10 cents each) and 1 nickel (5 cents) together for twice. What is the probability that the total value of coins on the heads is 15 cents?