A child types the letters q, w, e, r, t, y, randomly producing 1000 letters in all. what is the expected number of times that the sequence qqqq appears, counting overlaps
1/6*1/6*1/6*1/6 = 1/1296 = 0.078% probability of ANY 4-letter sequence (including qqqq) 1000/1296 is less than 1. Expected number of times qqqq (or any given 4-letter sequence) will appear in 1000 letters is 0.
