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If (R={(x,y):x=|y|,\ x\in{1,2},\ y\in{-2,-1,1,2}}), why is (R) not a function from (A={1,2}) to (B={-2,-1,1,2})?यदि (R={(x,y):x=|y|,\ x\in{1,2},\ y\in{-2,-1,1,2}}), तो (R) (A={1,2}) से (B={-2,-1,1,2}) में function क्यों नहीं है?
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: (x=1) has images (y=-1) and (y=1)(x=1) की images (y=-1) और (y=1) दोनों हैं
For (x=1), two possible (y)-values exist, so uniqueness fails. Read an absolute value relation with direction carefully.(x=1) के लिए दो possible (y) values हैं, इसलिए uniqueness टूटती है। absolute value relation को direction के साथ पढ़ें।
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