यदि \(f:\mathbb{Z}\to\mathbb{Z}\), (f(n)=2n) है, तो (f) आच्छादी क्यों नहीं है?
If \(f:\mathbb{Z}\to\mathbb{Z}\), (f(n)=2n), why is (f) not onto?
Explanation opens after your attempt
A. क्योंकि विषम पूर्णांक नहीं मिलतेBecause odd integers are not obtained
Concept
(2n) हमेशा सम पूर्णांक होता है। / (2n) is always an even integer.
Why this answer is correct
सहप्रांत \(\mathbb{Z}\) में (1) जैसे विषम पूर्णांक भी हैं, जो परास में नहीं आते। / The codomain \(\mathbb{Z}\) contains odd integers such as (1), which are not in the range.
Exam Tip
आच्छादी जांचते समय छूटे हुए प्रकार के मान खोजें। / While testing onto nature, look for types of values that are missing.
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