Теорія ймовірностей та математична статистика 1. На пошту надійшло 20 листів, адресованих у 4 різних пункти по 5 у кожний.
З усіх листів вибирають 4. Знайти ймовірність того, що всі листи адресовані в
один пункт.
2. В урні містяться 10 білих і 7 чорних куль. Знайти ймовірність того, що дві з
трьох вийнятих навмання куль будуть одного кольору.
3. 10 студентів домовились їхати одним електропоїздом, але не договорились
про вагони. Знайти ймовірність того, що ні один з них не зустрінеться з іншим,
якщо в поїзді 10 вагонів.

     Once in a cloudy day, I started to walk alone in the road near forest. It was becoming dark and I still had to go far to reach my friend's house. I saw the sky was covered with dark, evilish clouds and I started to walk faster. When I looked at my right side, I saw trees were moving side to side and making strange noises. My heart started to beat repeatedly, I didn't knew what to do. No cars, no people, only me . That time I exactly knew what's gonna happen and it was the terrible storm. When the lighting groaned, I started to run. The noises was really frightening like it would hit me in any single seconds. After some minutes while running, I heard the strongest lightning ever which hit one of the tree. It fell infront of my legs and I shrinked. I was shaking to death when I saw the tree burning. Somehow I got into my friend's house and told them how weather can be so terrible.

     Once in a cloudy day, I started to walk alone in the road near forest. It was becoming dark and I still had to go far to reach my friend's house. I saw the sky was covered with dark, evilish clouds and I started to walk faster. When I looked at my right side, I saw trees were moving side to side and making strange noises. My heart started to beat repeatedly, I didn't knew what to do. No cars, no people, only me . That time I exactly knew what's gonna happen and it was the terrible storm. When the lighting groaned, I started to run. The noises was really frightening like it would hit me in any single seconds. After some minutes while running, I heard the strongest lightning ever which hit one of the tree. It fell infront of my legs and I shrinked. I was shaking to death when I saw the tree burning. Somehow I got into my friend's house and told them how weather can be so terrible.