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JEE Mains · Maths · STD 11 - 5. linear inequalities

माना \(\mathrm{A}=\{\mathrm{x} \in \mathbb{R}:[\mathrm{x}+3]+[\mathrm{x}+4] \leq 3\}\), \(\mathrm{B}=\left\{\mathrm{x} \in \mathbb{R}: 3^x\left(\sum_{r=1}^{\infty} \frac{3}{10^r}\right)^{\mathrm{x}-3}<3^{-3 \mathrm{x}}\right\}\) हैं, जहाँ \([\mathrm{t}]\) महत्तम पूर्णांक फलन है। तब

  1. A \(A \cap B=\phi\)
  2. B \(A = B\)
  3. C \(B \subset C , A \neq B\)
  4. D \(A \subset B , A \neq B\)
Verified Solution

Answer & Solution

Correct Answer

(B) \(A = B\)

Step-by-step Solution

Detailed explanation

\({[x]+3+[x]+4 \leq 3}\) \(2[x] \leq-4\) \({[x] \leq-2 \Rightarrow x \in(-\infty,-1) .}\) \(3^x\left(\frac{3 \cdot \frac{1}{10}}{1-\frac{1}{10}}\right)^{x-3} < 3^{-3 x}\) \(27 < 3^{-3 x}\) \(-3 x > +3\) \(x < -1 \quad \ldots \ldots \ldots \ldots \ldots . .(B)\) \(A=B\)
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