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JEE Mains · Maths · STD 11 - 14. probability

पांच संख्या \(x _1, x _2, x _3, x _4, x _5\) को यादृच्छिक तरीके से संख्याओं \(1,2,3, \ldots \ldots, 18\) से चुनी जाता है और बढ़ते क्रम \(\left( x _1 < x _2 < x _3 < x _4 < x _5\right)\) में व्यवस्थित की जाती है तब \(x _2=7\) और \(x _4=11\) की संभावना होगी।

  1. A \(\frac{1}{136}\)
  2. B \(\frac{1}{68}\)
  3. C \(\frac{1}{72}\)
  4. D \(\frac{1}{34}\)
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Answer & Solution

Correct Answer

(B) \(\frac{1}{68}\)

Step-by-step Solution

Detailed explanation

No. of ways to select and arrange \(x _{1}, x _{2}, x _{3}, x _{4}, x _{5}\) from \(1,2,3 \ldots \ldots \ldots \ldots \ldots . \ldots18\) \(n ( s )={ }^{18} C _{5}\) \(x_{1}\left (x_{2}\right) \quad x_{3} \quad\left(x_{4}\right)\quad x_{5}\) \(7\) \(11\)…
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