Question

How many combinations can be made by using 6 dots in Braille script?

• A. 64
• B. 63
• C. 61
• D. 62

Answer 1

The correct option is B 63

• A cell is made up of six dots that fit under the fingertips, arranged in two columns of three dots each.
• Each cell represents a letter, a word, a combination of letters, a numeral or a punctuation mark.
• The first ten letters of the alphabet are formed using the top four dots (1, 2, 4, 5). This results in 2*2*2*2*2*2=2^6=64 different patterns of raised/unraised dots.
• But, according to the Braille description, we must eliminate one of these 64 possible patterns, because at least one dot must be raised. Therefore, there are 63 possible raised-dot patterns.

So, the correct answer is '63'.