जॉइन Examsbookउत्तर : 4. "5/21"
In a party there are 5 couples. Out of them 5 people are chosen at random. Find the probability that there are at the least two couples ?5
प्र: In a party there are 5 couples. Out of them 5 people are chosen at random. Find the probability that there are at the least two couples ?
- 16/7false
- 219/21false
- 37/31false
- 45/21true
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उत्तर : 4. "5/21"
व्याख्या :
Answer: D) 5/21 Explanation: Number of ways of (selecting at least two couples among five people selected) = (⁵C₂ x ⁶C₁) As remaining person can be any one among three couples left. Required probability = (⁵C₂ x ⁶C₁)/¹⁰C₅= (10 x 6)/252 = 5/21