1) A 6-sided die is rolled. What is the probability of rolling a number less than 2?2)How many different 4-letter codes are there if only the letters A, B, C, D, E, F, G, H, and I can be used and no letter can be used more than once?
3) Two 6-sided dice are rolled. What is the probability the sum of the two numbers on the dice will be 4?
4)Find the nth term and the indicated term of the arithmetic sequence whose initial term, a, and common difference, d, are given.

a = -3; d = 3, a_n = ?;  a₁₀ = ?

5)How many different license plates can be made using 3 letters followed by 4 digits selected from the digits 0 through 9, if neither letters nor digits may be repeated? 
6) Find the sum of .... 2 + 4 + 6 + ... + 582
7)A bag contains 2 red marbles, 4 blue marbles, and 5 green marbles. If one marble is selected at random, determine the probability that it is blue.
8)Find the sum.
1 + 3 + 5 + ... + 1153

9)Find the sum.
-3 + 1 + 5 + 9 + 13 + ... + (4n - 7)

10)Find the sum.
3 + 6 + 9 + ... + 294

11)Find the sum.
(-6) + (-1) + 4 + 9 + ... + 39

12)Find the sum.
1 + 2 + 3 + ... + 461

13)How many different license plates can be made using 3 letters followed by 3 digits selected from the digits 0 through 9, if digits may be repeated but letters may not be repeated? 

14)A bag contains 15 balls numbered 1 through 15. What is the probability of selecting a ball that has an even number when one ball is drawn from the bag?
15)A group of 12 friends goes bowling. How many different possibilities are there for the order in which they play if the youngest person is to bowl first? 
16)In how many ways can 7 people each have different birth months?

17)How many 4-digit numbers can be formed using the digits 1, 2, 3, 4, 5, 6, 7, 8, 9, and 0? No digit can be used more than once.
18)12 different books are to be arranged on a shelf. How many different arrangements are possible?
19)Find the nth term and the indicated term of the arithmetic sequence whose initial term, a, and common difference, d, are given.
a = 4; d = -7
a_n = ?;  a₁₆ = ?