How to Count - Number of Ways (경우의 수)
Sum Rule : when the events cannot happen at the same time Product Rule : when the events happen in conjunction AND the number of leaves for each branch of the problem space tree is the same How to classify the problem space into events/sets : Rule 1) Do it exhaustivelyRule 2) Avoid over-counting! ex) There are N kids running around the field. How will you count them? Let's say we use the groups ..
Comp Sci/Tips
2018.04.26 20:58
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