Probability
Suppose that a boy remembers all but the last digit of his friend's telephone number. He decides to choose the last digit at random in an attempt to reach him. If he has only two dimes in his pocket (the price of one call is 1 dime), find the probability that he dials the right number before running out of money. Give your answer as a decimal number.
The answer is 0.2.
This section requires Javascript.
You are seeing this because something didn't load right. We suggest you, (a) try
refreshing the page, (b) enabling javascript if it is disabled on your browser and,
finally, (c)
loading the
non-javascript version of this page
. We're sorry about the hassle.
1 solution
