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Hidden rule a @ b = (a + b)^2: find it from the examples and apply

This type of question, asked 2 times: 14 Sep 2025 S3, 17 Sep 2025 S2. All 2 questions below, oldest first.

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  1. Question 1

    14 Sep 2025 S3

    20
    If 2 @ 3 = 25 and 3 @ 4 = 49, what is 4 @ 5?

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  2. Question 2

    17 Sep 2025 S2

    19
    If 2 $\text{\textdollar} 2 = 16 and 3 $\text{\textdollar} 3 = 36, what is 4 $\text{\textdollar} 4?

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