What is a Sequence?When we write a list of numbers in a certain order, we form what's called a sequence. For example, here are Tom's last 5 English grades: 93, 85, 71, 86, 100. This list of numbers is called a sequence.
Here's another sequence: 5, 10, 15, 20, 25, 30 . . . This is an example of what's called an infinite sequence. Infinite sequences go on forever without end. If you see the three dots at the end of a sequence, you'll know that it continues on and is an infinite sequence. A finite sequence is a sequence that stops after a certain number of terms (like the list of Tom's English grades). Each number in a sequence is called a term. The first number in the list is called the 1st term, the second number is called the 2nd term, and so on. A sequence can be any ordered list of numbers, the numbers don't necessarily have to form any sort of pattern. In fact, a sequence doesn't even have to have numbers! You could write down a list of words or symbols to form a sequence too. For example, the list {red, yellow, green} is considered a sequence too.

