7 Three letters are selected at random from the 8 letters of the word COMPUTER, without regard to order.
- Find the number of possible selections of 3 letters.
- Find the probability that the letter P is included in the selection.
Three letters are now selected at random, one at a time, from the 8 letters of the word COMPUTER, and are placed in order in a line.
- Find the probability that the 3 letters form the word TOP.