Every corner of every tile in a wall of three rows and four columns of oblong tiles is marked. How many line segments join two marked points along a tile edge?

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Accepted Answer

70. Each of the 4 flat lines holds 5 marked points: 4 × 52 = 40 . Each of the 5 upright lines holds 4: 5 × 42 = 30 . Total 40 + 30 = 70 .

Every corner of every tile in a wall of three rows and four columns of oblong tiles is marked. How many line segments join two marked points along a tile edge?

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