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The idea of froth floatation method came from a person \( X \) and this method is related to the process \( Y \) of ores. \( X \) and Y, respectively, are:

1. fisher woman and concentration
2. washer man and reduction
3. washer woman and concentration
4. fisher man and reduction

Correct answer: washer woman and concentration

Solution

Froth flotation was inspired by the washing action used by a washer woman, where lighter impurities are separated from heavier material. In metallurgy, it is a concentration method because it increases the proportion of the desired ore mineral.

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