GCSE Secondary Maths Age 13-17 - Algebra: Sequences - Explained

The video tutorial explains how to identify and continue an arithmetic sequence, derive the formula for the Nth term, and check if a specific number is part of the sequence. It uses a GCSE paper example to illustrate these concepts, emphasizing the importance of understanding the sequence's pattern and solving equations to verify membership in the sequence.

What is the common difference in the given arithmetic sequence?

• 4

• 7

• 6

• 5

How do you express the Nth term of the sequence?

• 6N + 5

• N + 6

• 5N + 6

• 6N

What is the first step to check if 121 is part of the sequence?

• Multiply 121 by 6

• Subtract 5 from 121

• Divide 121 by 6

• Add 6 repeatedly to the sequence

Why is 121 not part of the sequence?

• 121 does not result in an integer N

• 121 is greater than the last term

• 121 is not a multiple of 6

• 121 is less than the first term

What is necessary to gain full marks for the question about 121?

• Just a yes or no answer

• A detailed explanation

• A guess based on intuition

• A calculation without explanation