Mathematics · Probability
एक बक्से में 7 काली गेंदें, 5 बैंगनी गेंदें और 3 पीली गेंदें हैं। यदि 2 गेंदें यादृच्छिक रूप से निकाली जाती हैं, तो चुनी गई दोनों गेंदों के या तो काली या बैंगनी होने की प्रायिकता क्या है?
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