1. The problem states that the final answer for part a) is \(\frac{63}{65}\) according to the mark scheme. 2. To verify this, we need to understand the original question and the steps leading to this fraction. 3. Typically, such a fraction might come from simplifying a ratio, probability, or fraction addition/subtraction. 4. If you provide the original problem or expression, I can show the detailed steps to reach \(\frac{63}{65}\). 5. Without the original problem, I confirm that \(\frac{63}{65}\) is a simplified fraction and likely the correct final answer as per the mark scheme.