in Combinatory retagged by
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Couldn't understand the method they have used to find the answer. Please explain

in Combinatory retagged by
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Best answer

0 length string (null) = 1
1 length string (a,b,c,d) = 4
2 length string (combination of 2) = 42

1 length string (combination of 3) = 43

Add all 3 you will get 85
 

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