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If (f={(1,2),(2,3),(3,4)}) is considered as a relation from (A={1,2,3,4}) to (B={2,3,4,5}), why is it not a function from (A) to (B)?यदि (f={(1,2),(2,3),(3,4)}) को (A={1,2,3,4}) से (B={2,3,4,5}) में relation माना जाए, तो यह (A) से (B) में फलन क्यों नहीं है?
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: (4\in A) has no image(4\in A) की कोई image नहीं है
Every element of (A) must have an image, but (4) is missing. An unused element of the codomain does not make a function invalid.(A) के हर element की image होनी चाहिए, लेकिन (4) missing है। codomain का कोई unused element होना function को गलत नहीं बनाता।
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