题目
When written in ascending order, the nine internal angles from three particular triangles form a sequence where the difference between any adjacent pair of numbers in the sequence is a constant d. One of the angles measures 42. Find all possible values of the size of the largest of the nine angles. 三个特定三角形中的9个内角度数按升序排列可组成一个数列，这个数列中任意两个相邻数字之差恒为 d。已知其中一个内角为 42°，求这 9个内角中最大角的所有可能值。 ——CMO、隐含约束、等差数列、〚CMO-2024.4〛
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