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The addition problem 11 add 2 is 13. This is a basic math problem that is learned in elementary school.
-9 + 11 = 2
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b-11 = -13 add 11 to BOTH sides b = -2
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The pattern alternates between adding 11 and adding 2. Starting with 11, we add 11 to get 22, then add 2 to get 13, and continue this pattern. Following this sequence, after 17, we add 11, resulting in 28. Therefore, the next number is 28.