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In an election, 2 candidate, 3 candidates and 4 candidates campaign for A position, B position and C position, respectively. If every voter must choose one candidate for each position, how many different ways can a voter fill the voting ballot?
A 3-digit integer is formed by 3 different integers selected from 1,2,3,4,5. How many different such 3-digit integer?

There are 200 people, shown as the following graph. Now choose one person from each of sophomore,junior,senior to form a committee, how many combinations will there be?
n is the number of a 3-digit integer which has at least two "1"in its digits.

Quantity A

n

Quantity B

29


How many integers between 100 and 299 (inclusive) have a units digit between 3 and 9 (inclusive)?
Among the 300 students who sign up for a course, 9% are sophomore, 3% are junior and 1% is senior. If a teacher randomly selects 3 students form them, then how many different combinations of a sophomore student, a junior student and a senior student will be there?
In how many different ways can we use 0, 1, 2, 3, 4, to form a 4-digit number which must be a multiple of 3 (None of the five numbers can be used more than once)?
S={1, 2, 3, 4, 6}

T={1, 2, 3, 6, 8}

x is a number in set S, and y is a number in set T. What's the total number of all the different possible values of the product of x and y?
The hundreds digit and tens digit of a three-digit integer $$n$$ is odd and even,respectively. If the units digit is a number different from other two digits, what is the number of the possible value of $$n$$?
A 4-digit integer is formed by four integers selected from 0, 1, 2, 3 and the same figure can be repeatedly used. If the sum of the 4 digits is 3, how many different integers can be formed?
A 4-digit integer is formed by four integers selected from 0, 1, 2, 3, 4 and the same figure can be repeatedly used. If the sum of the 4 digits is 4, how many different integers can be formed?
Which of the following is a perfect square?
n is a positive even integer.

Quantity A

$$\frac{n!}{(n-2)!}$$

Quantity B

$$(2)(\frac{n}{2})!$$


A password is formed by 5 different letters (A, B, C, D, E), if no letter can be repeated in one password, how many different passwords can be formed?
How many 5-digit odd integers can be formed out of 3, 4, 6, 7, 9 such that each number is used for only once?
A father purchased theater tickets for 6 adjacent seats in the same row of seats for himself, his wife, and their 4 children. How many seating arrangements are possible if the father and mother sit in the 2 middle seats?
There are three different frames and five different pictures. Now choose three pictures to put into frames, one for each frame, how many possible ways to put them.
A students selects books for reading material randomly,and which of the following has exactly 10 different ways of selection?
Indicate all such statements.
S={1, 3, 5, 7,.............,397, 399}

Set S consists of the odd numbers from 1 to 399, inclusive. How many different ordered pairs $$(p, t)$$ can be formed, where $$p$$ and $$t$$ are numbers in S and $$p \lt t$$?

(Note: The sum of the integers from $$1$$ to $$n$$, inclusive, is given by the formula $$\frac{n(n+1)}{2}$$ for all positive integers $$n$$.)
There are four people, S, M, K and R. Some people should be selected from these four people to form a committee. The committee is required to have at least two people. How many different methods are there in total?

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