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Hidden rule a @ b = (a + 1) x b or a x (b + 1): find it from the examples and apply

This type of question, asked 3 times: 15 Sep 2025 S1, 23 Sep 2025 S2, 24 Sep 2025 S2. All 4 questions below, oldest first.

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  1. Question 1

    15 Sep 2025 S1

    16
    If 4 # 2 = 10 and 6 # 3 = 21, what is 8 # 4?

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  2. Question 2

    23 Sep 2025 S2

    4
    If 1×2=31 \times 2 = 3, 2×3=82 \times 3 = 8, 3×4=153 \times 4 = 15, then 4×5=?4 \times 5 = ?

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  3. Question 3

    23 Sep 2025 S2

    3
    If 2×3=82 \times 3 = 8, 3×4=153 \times 4 = 15, then 4×5=?4 \times 5 = ?

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  4. Question 4

    24 Sep 2025 S2

    6
    If 4#2=10 5#3=18 6#4=28 Then what is 7#5=?

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