Mathematics · Probability
एक व्यक्ति चार पत्र लिखता है और चार लिफाफों पर पते लिखता है। यदि पत्रों को यादृच्छिक रूप से लिफाफों में रखा जाता है, तो इसकी प्रायिकता क्या होगी कि सभी पत्र सही लिफाफे में न रखे जाएँ?
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