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A symbol ‘△’ stands for a hidden rule, not ordinary multiplication. 3 △ 4 = 21 6 △ 7 = 24 Find the value of: 8 △ 9 = ?

1. A symbol ‘△’ stands for a hidden rule, not ordinary multiplication.
3 △ 4 = 21
6 △ 7 = 24
Find the value of: 8 △ 9 = ?

 

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