Advertisements
Advertisements
प्रश्न
A speaks truth in 75% cases and B in 80% of the cases. In v1hat percentage of cases are they likely to contradict each other. narrating the same incident?
पर्याय
5%
15%
35%
45%
Advertisements
उत्तर
35%
Explanation:
A Speak truth 75% i.e. P(A) =`3/4` `"P"(overline ("A")) =1/4`
Similarly 80% i.e. `"P"("B") =4/5 "P"(overline ("B") )=1/5`
While contradicting the narration
Probability =`"P"("A") ="P" (overline("B"))+"P"(overline("A"))"PB"`
`=3/4xx1/5+1/4xx4/5=7/20` or `7/20xx100=35%`
APPEARS IN
संबंधित प्रश्न
Sonika invested an amount of Rs 5800 for 2 years. At what rate of compound interest will she get an amount of Rs 594.50 at the end of two years?
Choose the most appropriate option:
A man earns ₹ 20 on the first day and spends ₹15 on the next day. He again earns ₹20 on the third day and spends ₹15 on the fourth day. If he continues to save in this way, how soon will he have ₹60 in hand?
A mixture of 40 litres of milk and water contains 10% of water. How much water is to be added to the mixture so that the water maybe 20% in the new mixture.
The length of a square is increased by 15% and breadth decreased by 15%. The area of the rectangle so formed is
Mohan credits 15% of his salary into his bank and spends 30% of the remaining amount on household articles. If cash on hand is ₹2,380/-, what is his salary?
72% of students in a class took Physics and 44% took Mathematics. If each student took Physics or Mathematics and 40 took both, the total number of students in the class would be
A fruit seller had some apples. He sells 40% apples and still has 420 apples. Originally, he had
In a factory, 60% of the workers are above 30 yr and of these 75 % are males and the rest are females. If there are 1350 male workers above 30 yr, the total number of workers in the factory is
A has some mangoes. He sold 40% more than he ate. If he sold 70 mangoes, how many did he eat?
Fresh grapes contain 90% water by weight while dried grapes contain 20% water by weight. What is the weight of dry grapes available from 20 kg of fresh grapes?
