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Which relation has the complete set of first components (A={1,2,3,4}) but still is not a function from (A) to (B={a,b,c})?किस संबंध में प्रथम घटकों का समुच्चय (A={1,2,3,4}) पूरा है लेकिन फिर भी वह (A) से (B={a,b,c}) में फलन नहीं है?
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: ({(1,a),(2,b),(3,c),(4,a),(4,b)})({(1,a),(2,b),(3,c),(4,a),(4,b)})
In option (C), (4) has two images (a) and (b). Having all first components is not enough; uniqueness is also required.विकल्प (C) में (4) की दो छवियां (a) और (b) हैं। केवल सभी प्रथम घटकों का होना काफी नहीं, अद्वितीयता भी चाहिए।
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