How many patterns can six independent raised-or-unraised braille positions form, including the all-unraised pattern?

Answer & explanation

64.

Two choices at each of six positions give 2⁶ = 64. Excluding the blank would leave 63, which is why the inclusion is specified. Pattern capacity is not the number of alphabet letters.

Code

Charles Petzold

Chapter 3 · Braille and Binary Codes

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