Which statement correctly defines a sequence?

• A. A random set of numbers
• B. A set with no order
• C. An ordered list of numbers
• D. A single value

Answer: (C)

Sequences are ordered lists of numbers where the position of each number matters. That’s what the statement “an ordered list of numbers” captures: you can identify the first term, the second term, and so on, and changing the order changes the sequence. For example, 2, 5, 8, 11 is a sequence because the terms appear in a specific order, and the first term is 2, the second is 5, etc. If you scrambled the order to 5, 2, 8, 11, you’d have a different sequence. A set with no order wouldn’t tell you which term sits in which position, and a single value isn't a list of terms at all. Sequences can be finite or infinite, but the defining idea is the ordered progression of terms.