Mathematics · Probability

एक थैले में 7 सफेद, 6 लाल और 9 काली गेंदें हैं। यदि थैले में से यादृच्छिक रूप से (at random) दो गेंदें निकाली जाती हैं, तो दोनों गेंदों के काली होने की क्या प्रायिकता है?

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