Word Count : 167

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मान लीजिए कि 5 ∤ a या 5 ∤ b. प्रतिलोम सिद्धांत द्वारा प्रमाण करेंगे। मान लें कि 5 | (a² − 2b²). तब a² ≡ 2b² (mod 5). अब 5 के सापेक्ष __________ ______ __________ __________ ________ _________ _________.
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