Concept-wise Practice

function properties MCQ Questions for Class 12

function properties se related questions ko ek jagah revise karein. Har question me bilingual content, answer feedback aur explanation available hai.

Practice Questions

1 questions tagged with function properties.

फलन \(f:\mathbb{N}\to\mathbb{N}\), (f(n)=n+2) के लिए सही विकल्प चुनिए।

Choose the correct option for \(f:\mathbb{N}\to\mathbb{N}\), (f(n)=n+2).

Explanation opens after your attempt
Correct Answer

A. एकैकी है पर आच्छादी नहींOne-one but not onto

Step 1

Concept

(f(a)=f(b)\Rightarrow a+2=b+2\Rightarrow a=b), so the function is one-one.

Step 2

Why this answer is correct

Values like (1) and (2) in \(\mathbb{N}\) are not images of any (n), so it is not onto.

Step 3

Exam Tip

Always test one-one and onto separately. चरण 1: (f(a)=f(b)\Rightarrow a+2=b+2\Rightarrow a=b), इसलिए फलन एकैकी है। चरण 2: \(\mathbb{N}\) में (1) और (2) जैसे मान किसी (n) से नहीं मिलते, इसलिए आच्छादी नहीं है। चरण 3: एकैकी और आच्छादी को अलग-अलग जांचना चाहिए।

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