If a+b = 10 and both a and b are positive integers, what is the largest possible value for a?

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6

×
7

×
8

✓
9

×
10
If a+b = 10 and both a and b are positive integers, what is the largest possible value for a?
6
7
8
9
10
Since both a and b are positive integers, the minimum positive integer is 1. So the largest possible integer for a is 9