Wen Guotai Daniel's answer to Jack Black's International Baccalaureatte Maths HL question.
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Did it in a rush, but the method is clear. There might be shorter ways. Always remember solutions to P&C questions must be exhaustive and no overlapping. Cheers.
Date Posted:
6 years ago
Yes, please refer to the other answer given and conisder cases where 4, 5 & 6 are possible when the center digit is 1, 2 & 3. Cheers.
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