Hidden rule a @ b = a to the power b: find it from the examples and apply

This type of question, asked 3 times: 16 Sep 2025 S3, 19 Sep 2025 S1, 23 Sep 2025 S1. All 3 questions below, oldest first.

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Question 1
16 Sep 2025 S3
18 $If 8 # 2 = 64, 7 # 3 = 343, then 6 # 2 = ?$
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Question 2
19 Sep 2025 S1
20 $If 9 % 2 = 81 and 8 % 2 = 64, what is 7 % 2?$
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Question 3
23 Sep 2025 S1
4 $If 2 * 3 = 8, 3 * 4 = 81, then 4 * 5 = ?$
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