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

ગણ \(\left\{n \in N : 10 \leq n \leq 100\right.\) અને \(3^n-3\) એ \(7\) નો ગુણિત છે \(\}\) ના ઘટકોની સંખ્યા \(.........\) છે.

  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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