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JEE Mains · Maths · STD 11 - 1. set theory

मान लीजिए \(\mathrm{A}=\{\mathrm{n} \in[100,700] \cap \mathrm{N}: \mathrm{n}\) न तो 3 का गुणज है और न ही 4 का गुणज है\(\}\). तो \(\mathrm{A}\) में अवयवों की संख्या क्या है?

  1. A \(300\)
  2. B \(280\)
  3. C \(310\)
  4. D \(290\)
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Answer & Solution

Correct Answer

(A) \(300\)

Step-by-step Solution

Detailed explanation

\( \mathrm{n}(3) \Rightarrow \text { multiple of } 3 \) \( 102,105,108, \ldots . ., 699 \) \( \mathrm{~T}_{\mathrm{n}}=699=102+(\mathrm{n}-1)(3) \) \( \mathrm{n}=200 \) \( \mathrm{n}(3)=200 \) \( \because \mathrm{n}(4) \Rightarrow\) multiple of \(4\)…
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