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If (f:A\to B) is one-one and (A={p,q,r,s}), which image list is not possible?यदि (f:A\to B) एक-एक है और (A={p,q,r,s}), तो कौन सी छवि-सूची संभव नहीं है?
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: (f(p)=3,\ f(q)=5,\ f(r)=3,\ f(s)=7)(f(p)=3,\ f(q)=5,\ f(r)=3,\ f(s)=7)
Step 1: In a one-one function different inputs must have different images. Step 2: In the fourth option both (p) and (r) have image (3). Step 3: In such questions first look for repeated images.चरण 1: एक-एक फलन में अलग आगतों के प्रतिबिंब अलग होने चाहिए। चरण 2: चौथे विकल्प में (p) और (r) दोनों का प्रतिबिंब (3) है। चरण 3: ऐसे प्रश्नों में सबसे पहले दोहराए गए प्रतिबिंब को खोजें।
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