15. Out of group of 600 Japanese tourists who visited Nepal, 60% have been already to Khokana, Lalitpur and 45% to Changunarayan, Bhaktapur and 10% of them have been to both places. (a) Write the above information in set notation. (b) Illustrate the above information in a Venn diagram. (c) How many Japanese tourists have visited at most one place? (d) Why is the number of tourists not represented in percentage ?​