To guarantee that at least on pair o the numbers adds up to 9, you must select at least 3 numbers from the set by combination
1. First, select any two numbers from the set.
2. Now, calculate their sum.
3. If the sum of the two numbers is not equal to 9, select a third number from the set.
4. Determine the three numbers' sum.
5. If the sum of the three numbers is still not equal to 9, select a fourth number from the set and calculate the sum.
6. Repeat this process until the sum of the selected numbers is equal to 9 by combination
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