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B
Here you are talking about cardinality, the number of elements in a set.
Here you are talking about distance, a different concept...
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B
I think that the exercise purpose is to deduce Snell Descartes law from Hyugen's principle . While using Snell's law makes it shorter...
Like.
Here you are talking about cardinality, the number of elements in a set. Here you are talking about distance, a different concept...