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1. নিচের কোন দেশটির সাথে বাংলাদেশের কোন কূটনৈতিক সম্পর্ক নেই?
- A. হংকং
- B. হংকং
- C. হংকং
- D. হংকং
Answer: Option D
Explanation:
Let S be the sample space
Then, n(S) = number of ways of drawing 3 balls out of 15
= 15C3 = (15 × 14 × 13)/(3 × 2 × 1) = 455
Let E = event of getting all the 3 red balls
∴n(E) = 5C3 = 5C2 = (5 × 4)/(2 × 1) = 10
∴P(E) = n(E)/n(S) = 10/455 = 291
Then, n(S) = number of ways of drawing 3 balls out of 15
= 15C3 = (15 × 14 × 13)/(3 × 2 × 1) = 455
Let E = event of getting all the 3 red balls
∴n(E) = 5C3 = 5C2 = (5 × 4)/(2 × 1) = 10
∴P(E) = n(E)/n(S) = 10/455 = 291
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