An urn contains 10 pebbles numbered from 0 to 9. Three balls are drawn in succession from the urn with replacement. After each a draw a number is associated to the pebble and registered. If the numbers associated with the pebbles is for example 015 is drawn, we get $15.
(i) what is the probability of getting more than $9.
(ii) what is the probability of getting $100.
(iii) what is the probability of getting less than $100.