Subject
Bank Exam
Topic
City Bank Ltd. - Probationary Officer - 2016
The probability is that a coin will turn up heads on any toss. If the coin is to be tossed three times, what is the probability that on at least one of the tosses the coin will turn up tails ?
The probability is that a coin will turn up heads on any toss. If the coin is to be tossed three times, what is the probability that on at least one of the tosses the coin will turn up tails ?
ক)
\(\frac{1}{8}\)খ)
\(\frac{1}{2}\)গ)
\(\frac{7}{8}\)ঘ)
NoneExplanation
Solution: অনুবাদঃ একটি Coin টস করলে Head উঠার সম্ভাবনা যদি ঐ Coin টিকে তিনবার টস করা হয় তবে কমপক্ষে একবার Tail উঠার সম্ভাবনা কত ? একটি Coin সেট 3 বার Toss করলে সেই ঘটনার সংখ্যা = 2 3 = 8 এখন, কমপক্ষে 1 বার Tail আসার সম্ভাবনা = 1 - কখনোই Tail না আসার সম্ভাবনা = [ কখনোই Tail না আসার মানে হলো তিনবার Toss করলে সব বারই Head আসার ঘটনা । আর এধরনের ঘটনা হলো HHH যা মাত্র 1 বার ঘটবে ]Related questions
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