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माना प्राकृत संख्याओं के समुच्चय N पर परिभाषित संबंध ऐसा है कि `R = {(x,y) : x in N, y in N`, और `2x + y = 41}` तो R के प्रांत व परिसर ज्ञात कीजिए। जाँच कीजिए कि R (i) स्वतुल्य, (ii) सममित, (iii) संक्रामक है।

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R = {(1, 39), (2, 37), (3, 35),..(20,1)}
R का प्रांत का = {1, 2, 3,..20}
R का परिसर = {1, 3, 5,..39)
न स्वतुल्य, न सममित और न ही संक्रामक है।

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