Asked by Anonymous

In regards to the braille system(6 dots that can either be raised or not raised), how many symbols have exactly three raised dots?

I figured it would be C(6,3) but 20 seems a bit off??

Thanks in advance

Answers

Answered by oobleck
looks good to me -- they can be
123
124
125
126
134
135
136
145
146
156

234
235
236
245
246
256

345
346
356

456
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