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Question: A box contains 20 electric bulbs, out of which 4 are defective. Two bulbs are chosen at random form this box. The probability that at least one of these is defective is ___
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Question: A box contains 20 electric bulbs, out of which 4 are defective. Two bulbs are chosen at random form this box. The probability that at least one of these is defective is ___
Question 1: A box contains 20 electric bulbs, out of which 4 are defective. Two bulbs are chosen at random form this box. The probability that at least one of these is defective is ___
View topic: বিন্যাস, সমবেশ ও সম্ভাব্যতা (Permutation, Combination and Probability)
7/19
6/19
45065
3/19
Source: Sonali Bank Ltd Officer (Cash) 27.04.2018
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Answer: 7/19
Explanation:
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| Questions
Find the probability of selecting a prime number from a set of number 1 to 15 (both inclusive).
A husband and wife appear in an interview for two vacancies in the same post. The probability of husband,s selection is 1/7 and that of wife,s is 1/5. What is the probability that none of them will be selected?
The probability is 1/2 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?
একটি থলিতে নীল বল ১২টি, সাদা বল ১৬টি এবং কালো বল ২০টি আছে। দৈবভাবে ১টি বল নেয়া হলো, বলটি সাদা না হওয়ার সম্ভাবনা কত?
একটি তাসের প্যাকেট থেকে দৈবভাবে একটি তাস নিলে তা রুইতন বা রাজা হওয়ার সম্ভাব্যতা কত?
A word consists of 9 letters; 5 consonants and 4 vowels. There letters are chosen at random. What is the probability that more than one vowel will be selected?
একটি গোলাকার মুদ্রা টেবিলে রাখা হল । এই মুদ্রার চারপাশে একই মুদ্রা কতটি রাখা যেতে পারে যেন মুদ্রাগুলো মাঝের মুদ্রাটিকে এবং তাদের দু'পাশে রাখা দুটি মুদ্রাকে স্পর্শ করে ।
A zookeeper counted the heads of animal and found it to be 80. When he counted the legs of animals, he found the number to be 260. If the zoo had either Pigeons or horses, how many horses were there in the zoo ?
Your doctor gives you pills to take one for every half hour. How long does it require to take all the pills ?
In a 100m race, Jami beats Rony by 4 sec. If Jami allowed Rony to start 16m ahead of him, then Jami and Rony reach the finishing point at the same time. How long does Jami take to run the 100m race?
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ঐকিক নিয়ম (Unitary Method)
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