1. Let's start by understanding the problem you want to solve. Since you didn't specify a particular question, please provide the exact math problem for which you need a proper answer for your viva. 2. Once you provide the problem, I will explain the relevant formulas, rules, and step-by-step solution in a clear and detailed manner. 3. This approach will help you confidently present your answer during your viva. Please share the specific math question you want help with.