Предмет: Математика, автор: lerasnigur96

В урні 5 білих та 3 чорні кульки. навмання взято одну за одною 2 кульки. яка імовірність того що обидві вони білі? ПОМОГИТЕ, НУЖНО РЕШЕНИЕ

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Автор ответа: frontman86

В урні всього 5 + 3 = 8 кульок. Ймоврність, що перша біла 5 / 8. Ймовірність, що друга біла 4 / 7. Перемноживши ймовірності маємо 5 /14 або 35.71%

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No one knew how Mr. Sticky got in the fish tank.

"He's very small," Mum said as she peered at the tiny water snail. "Just a black dot."

In the morning Abby jumped out of bed and switched on the light in her fish tank.

Gerry, the fat orange goldfish, was dozing inside the stone archway. It took Abby a while to discover Mr. Sticky because he was clinging to the glass near the bottom, right next to the gravel.

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"Yes they are. Now hurry up, I'm going to miss my train."

At the weekend they cleaned out the tank. "There's a lot of filth on the sides," Mum said. "I'm not sure Mr. Sticky's quite up to the job yet."

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"Where's Mr. Sticky?" Abby asked.

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Abby looked on all sides of the tank. There was no sign of the water snail.

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That evening Abby went up to her bedroom to examine the tank. The water had settled and looked lovely and clear but there was no sign of Mr. Sticky. She went downstairs.

Her mum was in the study surrounded by papers. She looked impatient when she saw Abby in the doorway and even more impatient when she heard the bad news.

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Abby felt her face go hot and red. It always happened when she was furious or offended.

"You've poured him out, haven't you," she said. "You were in such a rush."

"I have not. I was very cautious. But he is extremely small."

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"Nothing at all. But it makes things hard to find."

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"Ah ha!" Mum suddenly cried.

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"Mrs. Sticky!" Abby breathed.

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C) because she didn’t want to go to bed.

D) to say goodnight.

5. Abby was angry with her Mum because

A) mother ignored her.

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D) mother was very strict.

6. Mother came to Abby’s room to look for Mr. Sticky with

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C) a magnifying glass.

D) a vacuum cleaner.

7. Abby felt happy and laughed because

A) mother came to help her look for Mr. Sticky.

B) they found Mr. Sticky in the fish tank.

C) the water in the fish tank was very clear and clean.

D) her mother was trying to make her laugh

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