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JEE Mains · Maths · STD 12 - 1. relation and function

मान लीजिए कि \(f:[0,3] \rightarrow\) A, \(f(x)=2 x^3-15 x^2+36 x+7\) द्वारा परिभाषित है और \(g:[0, \infty) \rightarrow B\), \(\mathrm{g}(x)=\frac{x^{2025}}{x^{2025}+1}\) द्वारा परिभाषित है। यदि दोनों फलन आच्छादक हैं और \(\mathrm{S}=\{x \in \mathbf{Z}: x \in \mathrm{~A}\) या \(x \in \mathrm{~B}\}\) है, तो \(\mathrm{n}(\mathrm{S})\) = ___

  1. A \(29\)
  2. B \(30\)
  3. C \(31\)
  4. D \(36\)
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Correct Answer

(B) \(30\)

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Detailed explanation

as \(f(x)\) is onto hence \(A\) is range of \(f(x)\)…
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