An urn contains 2000 lottery tickets, numbered from 1 to 2000. If we select a ticket at random, find the probability that the number on the ticket

(i) is a multiple of 6;

(ii) ends in 3 or 7;

(iii) does not end in 0, 2, 4, 6, or 8;

(iv) is divisible by at least one of the numbers 3, 5, 6.