9 questions
How many four-digit numbers can be formed with the digits 1, 2, 3 and 4? (you may use a digit more than once)
81
256
24
64
How many different combinations of management can there be to fill the positions of president, vice president and treasurer in a club if there are 12 eligible candidates?
9
132
1320
220
Using each digit once, how many 3 digit even numbers can be formed with the digits 4, 5 and 6?
2
3
6
4
How many (positive) three-digit odd numbers are there in the decimal system that consist of 3 different digits?
decimal system: uses the digits 0, 1, ... 9
Three digit numbers are formed using the digits 1, 2, 3, 4, 5 in with no repeating digits. How many such different numbers are there?
In a test, students wrote three-letter codes made up of the letters A, B and C on their papers instead of their names. Every possible code from AAA to CCC was given to a student, and there were no students with the same code. How many students took the test if all the possible codes were used?
How many different ways can the letters in the word "trial" be arranged such that the word will begin with a vowel?
24
48
72
120
How many 4-digit positive integers exist in the decimal system that have four different odd digits?
The five graduating classes in a school perform 1 dance each at the graduation ball. Class A performs the opening dance, but then he order of the other dances is decided by a draw. How many different orders are possible?