Question
A box consists of 125 apples out of which 25 are rotten.
Khushboo comes to buy non-rotten apple. The shopkeeper takes out two apples and hands it over to Khushboo one after another. If the apple is not rotten she buys else the shopkeeper keeps them back. What is the probability that Khushboo buys at least one apple?Solution
Case I: Khushboo buys two apples
Probability of buying first apple = (125 - 25)/125 = 100/125 = 4/5
Probability of buying second apple = (100 - 1)/(125 - 1) = 99/124
∴ Probability of buying two apples = (4/5) X (99/124) = 99/155
Case II: Khushboo buys one apple
Probability that she is offered non-rotten apple in first attempt and rotten in second = 100/125 X 25/124 = 5/31
Probability that she is offered rotten apple in first attempt and non - rotten in second = 25/125 X 100/125 = 4/25
∴ Required Probability = 99/155 + 5/31 + 4/25 = 24/25
Change the following sentence to Indirect Speech.
"You are welcome to stay a few days, Uncle Bill," I said quickly.
Radhika said, ‘How intelligent I am!’
Mohan will say, "I want two persons to assists me."
Select the correct direct form of the given sentence.
Shyam asked me how I had persuaded his sister.
Choose the option that is the indirect form of the sentence.
She said to him, “I don’t want to go there.”
Choose the option that is the indirect form of the sentence.
Kishore said “I’m leaving now.”
The teacher said to the children,"The sun always sets in the west."
My sister told that she ……….. to watch that movie.
Select the most appropriate indirect form of the given sentence.
Rani said to me, “A monkey bit me in the park.”
She always took her medicines on time.
Relevant for Exams:
