The GMAT often features combinatorics and probability questions, requiring a methodical approach to problem-solving. Here's how you can tackle similar problems:
- Carefully read and understand what the problem is asking.
- Identify and separate different cases or groups within the problem (e.g., cable vs. telephone wires).
- Use appropriate mathematical tools (like combinations) to calculate different cases.
- Consider complementary counting (subtracting unfavorable cases from the total) to simplify your solution.
- Double-check your steps to make sure no unfavorable scenarios are missed.
By following these steps, not only can you sail through combinatorics questions but also build a strong foundation for more complex GMAT problems. Practice regularly to familiarize yourself with different problem types and improve your speed and accuracy.