Mathematics · Linear Equations
एक बैग में केवल चार अलग-अलग रंगों की गेंदें हैं। इसमें 12 को छोड़कर सभी नीली गेंदें, 21 को छोड़कर सभी काली गेंदें, 20 को छोड़कर सभी लाल गेंदें और 19 को छोड़कर सभी हरी गेंदें हैं। बैग में कुल कितनी गेंदें हैं?
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