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The probability of happening an event A in one trial is 0.4. Find the probability that the event A happens at least one in three independent trials.
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Question 1
Of the students in a school, it is known that 30% have 100% attendance and 70% students are irregular. Previous year results report that 70% of all students who have 100% attendance attain A grade and 10% irregular students attain A grade in their annual examination. At the end of the year, one student is chosen at random from the school and he was found to have an A grade. What is the probability that the student has 100% attendance ? Is regularity required only in school ? Justify your answer. Question 2
Two players , and , are playing the final of a chase championship, which consists of a series of match Probability of , winning a match is 2/3 and that of is 1/3. The winner will be the one who is ahead by 2 games as compared to the other player and wins at least 6 games. Now, if the player , wins the first four matches find the probability of , wining the championship. 
| Question Text | The probability of happening an event A in one trial is 0.4. Find the probability that the event A happens at least one in three independent trials. |
