O-LevelMathematicsNumber4024/21 · Oct/Nov 2025 · Q152 Marks
x = 2² × 3ⁿ⁺¹ × 7 y = 2ⁿ × 3² × 7⁴ n is a positive integer greater than 2. Find the highest common factor (HCF) of x and y. Write your answer as the product of prime factors in terms of n.
Mark scheme
Marking points from the official mark scheme (Oct/Nov 2025). The mark or mark type is shown in brackets.
- 15 2² x 3² x 7 final answer [2] B1 for 2² or 3² or 7 in final answer
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