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Subjects
Class 12MathematicsRelations and FunctionsOnto functionEasy
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If (f:\mathbb{N}\to\mathbb{N}), (f(n)=n+1), why is (f) not onto?

Answer and explanation

Correct answer: Because (1) has no preimage

Step 1: For (n\in\mathbb{N}), the smallest value of (n+1) is (2). Step 2: The codomain (\mathbb{N}) contains (1), but no (n) satisfies (n+1=1). Step 3: For natural-number functions, check the smallest codomain values first.

Related tags

Natural NumbersNot OntoSuccessor FunctionCodomainOnto FunctionRelations And FunctionsMathematicsClass 12 Mcq
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10 more MCQs
  1. 1If (f:\mathbb{R}\to\mathbb{R}), (f(x)=x+5), which statement about (f) is correct?
  2. 2If (f:\mathbb{R}\to\mathbb{R}), (f(x)=x^2), why is (f) not onto?
  3. 3If (f:\mathbb{R}\to[0,\infty)), (f(x)=x^2), what is the correct statement about (f)?
  4. 4For sets (A={1,2,3}) and (B={a,b}), (f={(1,a),(2,b),(3,a)}). Choose the correct statement about (f:A\to B).
  5. 5For (A={1,2,3}) and (B={p,q,r}), (f={(1,p),(2,p),(3,q)}). Why is it not onto?
  6. 6If (f:\mathbb{R}\to\mathbb{R}), (f(x)=2x-7), what should (x) be for any (y\in\mathbb{R}) so that (f(x)=y)?
  7. 7If (f:\mathbb{Z}\to\mathbb{Z}), (f(n)=n-3), what is the correct statement about (f)?
  8. 8If (f:\mathbb{Z}\to\mathbb{Z}), (f(n)=2n), why is (f) not onto?
  9. 9If (f:\mathbb{R}\to(0,\infty)), (f(x)=e^x), which statement is correct?
  10. 10If (f:\mathbb{R}\to\mathbb{R}), (f(x)=e^x), why is (f) not onto?
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