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

समुच्चय \(A -\left\{ x \in N : x ^2-10 x +9 \leq 0\right\}\) से समुच्चय \(B =\left\{ n ^2: n \in N \right\}\) में ऐसे फलनों \(f\), जिनके लिए \(f ( x ) \leq( x -3)^2+1, x \in A\) है, की संख्या है \(........\)

  1. A \(1440\)
  2. B \(1450\)
  3. C \(1460\)
  4. D \(1470\)
Verified Solution

Answer & Solution

Correct Answer

(A) \(1440\)

Step-by-step Solution

Detailed explanation

\(\left( x ^{2}-10 x +9\right) \leq 0 \Rightarrow( x -1)( x -9) \leq 0\) \(x \in[1,9] \Rightarrow A =\{1,2,3,4,5,6,7,8,9\}\) \(f ( x ) \leq( x -3)^{2}+1\) \(x =1: f (1) \leq 5 \Rightarrow 1^{2}, 2^{2}\) \(x =2: f (2) \leq 2 \Rightarrow 1^{2}\)…
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