【单选题】Nine pieces of paper numbered consecutively from 1 to 9 are put into a hat. If one piece of paper is drawn at random from the hat, what is the probability that it will have an even number?
【单选题】is a one -way function that takes an arbitrarily long piece of plaintext and from it computes a fixed-length bit string. (72) is a protocol that most USENET machines now use it to allow news articles ...