Mathematics, 12.05.2021 18:20 lrasanaoaksandfurana

Farah is fascinated by the triangular numbers (1,3,6,10,15,21, and so on). Recently she came across a clock and found that she could rearrange the twelve numbers 1,2,3,…12 around the face so that each
adjacent pair added up to a triangular number. She left the twelve in its usual place.
What number did she put where the 6 would usually be?

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