Unit 1 · Patterns and Sequences
2, 5, 10, 17, 26 … — What Is the 7th Term?
Lesson 4 of 6
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About this lesson
Now let's step up to a more layered sequence type — one where the rule isn't immediately obvious. To crack it, you need to look one level deeper: at the gaps between consecutive terms rather than at the terms themselves.
Chapters
0:00Introduction
0:21The Question
0:49Uncovering the first level of differences
1:18Identifying the pattern of odd numbers
1:45Calculating the 6th and 7th terms
2:14Exam strategy — the square number shift shortcut
3:16Confirming the final option
Question
The first five terms of a sequence are:
2, 5, 10, 17, 26, …
What is the 7th term in the sequence?
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