ExamBro
ExamBro
JEE Mains · Maths · STD 12 - 13. probability

माना \(S=\{1,2, \ldots \ldots, 20\}\) है। \(S\) के एक उपसमुच्चय \(B\) को "nice" कहा जाता है यदि इसके अवयवों का योग \(203\) है। तो, \(S\) के एक यादृच्छया चुने गए उपसमुच्चय के "nice" होने की प्रायिकता है

  1. A \(\frac{7}{{{2^{20}}}}\)
  2. B \(\frac{5}{{{2^{20}}}}\)
  3. C \(\frac{4}{{{2^{20}}}}\)
  4. D \(\frac{6}{{{2^{20}}}}\)
Verified Solution

Answer & Solution

Correct Answer

(B) \(\frac{5}{{{2^{20}}}}\)

Step-by-step Solution

Detailed explanation

Sum of all elements of \(S=210\) So \(X\) be a nice set if \(x=\{S-\{7\}, S-\{1,6\}, S-\{2,5\}, S-\{3,4\}, S-\{1,2,4\}\}\) \(P(x)=\frac{5}{2^{20}}\) \(\therefore(2)\) is the answer.
Same subject
Explore more questions on app
From JEE Mains
Explore more questions on app