Bonjour Gloria, 
Here is the lesson that addresses this exact scenario:
"Des" becomes " de/d' " in front of adjectives preceding nouns (French Articles)">https://progress.lawlessfrench.com/revision/grammar/use-de-d-instead-of-des-in-front-of-adjectives-preceding-nouns-partitive-article
In short, des is the contracted version of de + les . 
Bonne chance.
Why de grands hommes and not des grands hommes..?
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Gloria B.Kwiziq community member
Why de grands hommes and not des grands hommes..?
This question relates to:French lesson "Standalone adjectives after c'est are always masculine"
Asked 8 years ago
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