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यदि X = {a,b,c,d} , तो निम्नलिखित में X से X में एक फलन हैं -A. `R_(1) = { (b , a) , (a , b), (c , d) , (a , c)}`B. `R_(2) = {(a, d) , (d , c) , (b, b) , (c, c) }`C. `R_(3) = { (a , b) , (b , c) , (c ,d) , (b ,d)}`D. `R_(4) = {(a,a) , (b ,b) , (c, c), (c ,d)}` .

Answer» Correct Answer - b


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