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it was madam c.j. walker and it was in the early 1920's to 1930's i believe. She was one of the, if not the most, wealthiest black women of her time.

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Q: What black women used the trail and error method to invent hair care products and in what year?
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Learning by the trial and error method was discovered by?

Learning by "trial and error method" was discovered by - THORNDIKE


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