English has 26 different letters. How many consecutive words have to be selected in a book to have at least 4 that start with the same letter? Words to select: Ex: 20

6. Rainy Days A weather forecast system predicts rain using three models: \( M_{1}, M_{2}, M_{3} \). - \( M_{1} \) is used \( 50 \% \) of the time, \( M_{2} 30 \% \), and \( M_{3} 20 \% \). - The probabilities of correctly predicting rain are \( 85 \%, 80 \% \), and \( 90 \% \) for \( M_{1}, M_{2} \), and \( M \) respectively. A random day is selected. - What is the probability that rain is correctly predicted?

If you draw a card from a deck and do not replace it, what type of events does this represent when drawing a second card?

6. Rainy Days A weather forecast system predicts rain using three models: \( M_{1}, M_{2}, M_{3} \). - \( M_{1} \) is used \( 50 \% \) of the time, \( M_{2} 30 \% \), and \( M_{3} 20 \% \). - The probabilities of correctly predicting rain are \( 85 \%, 80 \% \), and \( 90 \% \) for \( M_{1}, M_{2} \), and respectively. A random day is selected. - What is the probability that rain is correctly predicted?

English has 26 different letters. How many consecutive words have to be selected in a book to have at least 4 that start with the same letter? Words to select: Ex: 20

3 лыжных гонках участвуют 5 спортсменов из России, 8 спортсменов из Норвегии 12 спортсмена из Швеции. Порядок, в котором спортсмены стартуют, определяется жребием. Найди зероятность того, что первым будет ттартовать спортсмен из Норвегии.