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वास्तविक संख्याओं के समुच्चय R पर द्विआधारी संक्रिया * इस प्रकार परिभाषित है कि a*b = 5ab/13 ∀ a, b ∈ R तो संक्रिया * के लिए तत्समक अवयव ______ है।

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वास्तविक संख्याओं के समुच्चय R पर द्विआधारी संक्रिया * इस प्रकार परिभाषित है कि a*b = 5ab/13 ∀ a, b ∈ R तो संक्रिया * के लिए तत्समक अवयव 13/5 है।

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