Lottery balls numbered consecutively from one through one hundred are placed in a spinner. If one ball is drawn at random, what is the probability that it will have the number 1 on it exactly once?	Answers.
A) 9/100 B) 1/10 C) 11/100 D) 19/100 E) 1/5
Probability = No of balls with exactly one 1 / total number of balls   = {1,10,12 to 19, 21,31,41,51,61,71,81,91,100}/100   = 19/100   Answer is 19/100
<result>D</result>
Lottery balls numbered consecutively from one through one hundred are placed in a spinner. If one ball is drawn at random, what is the probability that it will have the number 1 on it exactly once?