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JEE Mains · Maths · STD 11 - 14. probability

સંખ્યાઓ \(1,2,3, \ldots ., 18\) માંથી પાંચ સંખ્યાઓ \(x_{1}, x_{2}, x_{3}, x_{4}, x_{5}\) ને યાદચ્છિક રીતે પસંદ કરી ચઢતા ક્રમમાં \(\left( x _{1}< x _{2}< x _{3}< x _{4}< x _{5}\right)\) તો  \(x_{2}=7\) અને \(x_{4}=11\) ની સંભાવના \(\dots\dots\dots\) છે.

  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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