Examine the sequence:

What number goes into the circle?

Which of the following can be the next number after 47 in the sequence below?

Given a set , which of the following sets could we assign to such that ?

Find the missing part of the list:

Nine students are running for student council; each member of the student body will choose four.

The candidates include two of Eileen's sisters, Maureen and Colleen. Eileen wants to vote for one or both of them. How many ways can Eileen fill out her ballot so that one or both of her sisters is among her choices?

Jack noticed that a group of prime numbers followed a pattern in which they increased by 2, then 4, in an alternating pattern:

(11 plus 2 is 13, 13 plus 4 is 17, 17 plus 2 is 19, 19 plus 4 is 23.)

Jack believes that this pattern applies for all prime numbers, not just this group.

Which of the following is the best counter argument to his belief?

Define set . Which of the following sets could we define to be set so that ?

The Department of Motor Vehicles wants to make all of the state's license numbers conform to two rules:

Rule 1: The number must comprise two letters (A-Z) followed by four numerals (0-9).

Rule 2: Numerals can be repeated but not letters.

Which of the following expressions is equal to the number of possible license numbers that would conform to this rule?

A pair of fair dice are tossed. What is the probability that the product of the numbers of the faces is greater than or equal to ?

Define

What is the natural domain of ?