November 2021 Paper 1 Q20
20 Miriam’s date of birth is \(\quad\) 14/09/2006
She makes a 4-digit number code using digits from her date of birth.
The 4-digit number she makes must
not start with 0
have all different digits.
How many codes can she make? [3 marks]
| Answer | Mark | Comments |
|---|---|---|
| \(5 \times \ldots\) | M1 | oe eg listing the 5 possible first digits |
| \(5 \times 5 \times 4 \times 3\) | M1dep | |
| 300 | A1 | SC1 \((6 \times 5 \times 4 \times 3 =)\ 360\) |