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Which option is not a function from (A={1,2,3,4}) to (B={a,b,c}) even though every element of (A) occurs as a first component?किस विकल्प में (A={1,2,3,4}) से (B={a,b,c}) में फलन नहीं है जबकि (A) का हर अवयव प्रथम घटक के रूप में मौजूद है?
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: ({(1,b),(2,c),(3,a),(4,b),(3,c)})({(1,b),(2,c),(3,a),(4,b),(3,c)})
In option (C), (3) has two images (a) and (c). A function requires both existence and uniqueness.विकल्प (C) में (3) की दो छवियां (a) और (c) हैं। फलन के लिए पूर्णता के साथ अद्वितीयता भी जरूरी है।
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