Tantalizer 415: Dizzy spell
18 December 2019
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From New Scientist #965, 4th September 1975 [link]
Here is a simple prescription for vertigo. Draw a 4×4 grid (16 cells in a 4×4 array). Write a V in the bottom left corner, an E in each of the two adjacent cells, and R in each of the three empty cells adjacent to an E, a T in each of the four empty cells adjacent to an R, an I in each of the three empty calls adjacent to a T, a G in each of the two empty cells adjacent to an I and an O in the top right corner.
To induce mild vertigo, work out how many ways there are of spelling VERTIGO, starting the the bottom left corner and ending at the top right, as if you were an ant taking exercise. The answer is 20. Feeling better?
Tougher exercise can induce schizophrenia. So start again with a 7×7 grid and repeat the prescription with SCHIZOPHRENIA.
How many ant-like ways are there of spelling that?