Foundation November 2023 Paper 3 Q8
8 Here are the first four terms of a number sequence.
97 91 85 79
(a) Explain how to work out the next number of the sequence. (1)
(b) Work out the difference between the 5th term and the 7th term of the sequence. (2)
(c) Explain why 52 is not a number in this sequence. (1)
| Answer | Mark | Mark scheme |
|---|---|---|
| Explanation | C1 | for explanation, eg subtract 6, decrease by 6, going down by 6 |
| Answer | Mark | Mark scheme |
|---|---|---|
| 12 | M1 | for \(73 - 61\) or \(6 \times 2\) |
| A1 | cao |
Additional guidance
At least one term must be correct and intention to subtract shown
Accept \(-12\)
| Answer | Mark | Mark scheme |
|---|---|---|
| Explanation | C1 | for explanation relating to odd and/or even numbers Acceptable 52 is even the sequence is odd numbers it goes to 55 (and you cannot reach 52) it goes to 49 (which has gone past 52) \(n\)th term is \(103 - 6n = 52\) which has no integer solutions 52 is between the 8th and 9th terms Not acceptable subtracting 6 each time will not lead to 52 it goes past 52 |