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
            
        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
    
123
124
125
126
134
135
136
145
146
156
234
235
236
245
246
256
345
346
356
456
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