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JEE Mains · Maths · STD 11 - 6. permutation and combination

माना \(S =\{1,2,3,4,5,6,9\}\) है। तो समुच्चय \(T =\{ A \subseteq S : A \neq \phi\) तथा \(A\) के सभी अवयवों का योगफल \(3\) का गुणज नहीं है \(\}\) में अवयवों की संख्या है ........ |

  1. A \(20\)
  2. B \(40\)
  3. C \(80\)
  4. D \(120\)
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Answer & Solution

Correct Answer

(C) \(80\)

Step-by-step Solution

Detailed explanation

\(3n\) type \(\quad \rightarrow 3,6,9=\mathrm{P}\) \(3 \mathrm{n}-1 \quad\) type \(\rightarrow 2,5=\mathrm{Q}\) \(3 \mathrm{n}-2\quad\) type \(\rightarrow 1,4=\mathrm{R}\) number of subset of \(S\) containing one element which are not divisible by \(3\)…
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