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If (f:A\to B) is one-one and (A={p,q,r}), which of the following image lists is not possible?यदि (f:A\to B) एक-एक है और (A={p,q,r}), तो निम्न में से कौन सी छवि-सूची संभव नहीं है?
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: (f(p)=2,\ f(q)=3,\ f(r)=2)(f(p)=2,\ f(q)=3,\ f(r)=2)
Step 1: A one-one function needs three distinct images for three distinct inputs. Step 2: In the first option both (p) and (r) have image (2). Step 3: In such options the fastest method is to look for repeated images.चरण 1: एक-एक फलन में तीन अलग आगतों के तीन अलग प्रतिबिंब होने चाहिए। चरण 2: पहले विकल्प में (p) और (r) दोनों का प्रतिबिंब (2) है। चरण 3: विकल्पों में दोहराया हुआ प्रतिबिंब खोजना सबसे तेज तरीका है।
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