Little Simon, who can neither read nor write, plays with his grandfather's typewriter. It has 41 keys of the same size, on which there are markings: 26 capital letters of the English alphabet, 10 numbers and 5 symbols.
Simon presses one of the keys. What is the probability of the event A that he will press one of the letters of his name?
Simon blindly types 5 characters. What is the probability of the event B that he writes his name? What is the probability of the event C that he writes all the letters of his name?
Simon blindly types 3 characters. What is the probability of the event that D typed three identical digits if we know that he pressed the even digit key first?
Simon blindly types 12 characters. What is the probability of the event E that he typed a letter of the English alphabet exactly ten times?
