If you toss a coin, the chance of getting a "head" is 50%. That is , chance is 1/2 or 0.5 ( That means, if a coin is thrown 2 times, you will likely to get one head or if you toss the coin 100 times, you are likely get 50 heads ) . The probability of getting any one (head or tail) is 100% or 1. The probability of getting no head and no tail is zero. Hence the limits of probability are 0 (no chance) and 1 (guaranteed). The chance of drawing " king of diamond" from a deck of cards is 1/52. The chance of rolling a 'Three' in a dice game is 1/6 (since six faces). Thus goes the probability.
Can a child, a monkey or a blind folded man (without the knowledge of typewriting ) type a word or two correctly? Can a computer write a poem? let us see.
Let us take two words NO and YES. What is the chance of typing 'N' randomly. We know , it is 1/26. The chance of typing 'O' is also 1/26. Then, what is the chance of typing N and O consequently. The multiplication rule in statistics says, it is 1/26 * 1/26 = 1/676. It means, if you type 676 times randomly on your keyboard, you will get a 'NO' at some instant. For 'YES" the chance is 1/26 *1/26 * 1/26 = 1/17576, it will take longer to get an 'YES'
Machine can type in random manner fast. With proper rules (algorithm), they can coin words, sentences or even poem.