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प्रायिकता ज्ञात कीजिए कि दो मित्रों के जन्मदिन भिन्न-भिन्न हैं। (लीप वर्ष नहीं)।

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चूँकि संबंधित वर्ष लीप वर्ष नहीं है।

इसलिए कुल दिनों की संख्या = 365

∴ दोनों मित्रों के जन्मदिनों के कुल प्रकार = 365 x 365

जब, दोनों मित्रों के जन्मदिन समान होने पर कुल अनुकूल परिणामों की संख्या = 365

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