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

समुच्चय \(\left\{\mathrm{n} \in \mathbb{N}: 10 \leq \mathrm{n} \leq 100\right.\) तथा \(3^{\mathrm{n}}-3,7\) का एक गुणज है \} में अवयवों की संख्या है :

  1. A \(15\)
  2. B \(14\)
  3. C \(13\)
  4. D \(12\)
Verified Solution

Answer & Solution

Correct Answer

(A) \(15\)

Step-by-step Solution

Detailed explanation

\(n \in[10,100]\) \(3^{ n }-3 \text { is multiple of } 7\) \(3^{ n }=7 \lambda+3\) \(n =1,7,13,20, \ldots .97\) Number of possible values of \(n=15\)
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