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Operation defined by a formula (e.g. a % b = a + b + ab): evaluate

This type of question, asked 3 times: 12 Sep 2025 S2, 24 Sep 2025 S3, 26 Sep 2025 S1. All 3 questions below, oldest first.

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  1. Question 1

    12 Sep 2025 S2

    24
    If 16+11=A16+11=A and 19=B\frac{1}{9}=B, and A%B=(A×B)−1A \% B=(A \times B)-1, then what is A % B?

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  2. Question 2

    24 Sep 2025 S3

    7
    Let a% b = a + b + ab Then 2 % 3 = ?

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  3. Question 3

    26 Sep 2025 S1

    4
    If A & B = A ×\times B - A, what is 7 & 5?

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