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নিচের কোন দেশটির সাথে বাংলাদেশের কোন কূটনৈতিক সম্পর্ক নেই?
হংকং
মালদ্বীপ
পাকিস্তান
তাইওয়ান
ANSWER : 4
Descrption
Let S be the sample space <br/> Then, n(S) = number of ways of drawing 3 balls out of 15 <br/> = 15C3 = (15 × 14 × 13)/(3 × 2 × 1) = 455 <br/> Let E = event of getting all the 3 red balls <br/> ∴n(E) = 5C3 = 5C2 = (5 × 4)/(2 × 1) = 10 <br/> ∴P(E) = n(E)/n(S) = 10/455 = 291
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