Unit 1 · Patterns and Sequences

3, 6, 12, 24 … — 4th to 6th Difference?

Lesson 3 of 6

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About this lesson

The sequence 3, 6, 12, 24 doubles each time. The question asks for the difference between the 4th and 6th terms — so you need to generate two more terms first, then subtract. The most common trap is confusing the 6th term (96) for the answer, or finding the difference between the wrong pair of terms.

Chapters

0:00Introduction

0:22The Question

0:54Decoding the sequence pattern

1:20Expanding to find the 5th and 6th terms

1:41Calculating the absolute difference

2:00Exam strategy — the multiplier factor shortcut

2:47Confirming the final option

Question

Here are the first four terms of a number sequence: 3, 6, 12, 24, \dots What is the difference between the 4th term and the 6th term in this sequence?

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Lesson 2 Lesson 4

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