There are 1350 examinees in an examination. Out of them, 700 passed in Account, 600 passed in Economics, 350 passed in statistics and 50 failed in all of these three subjects. Moreover, 200 passed in Economics and Statistics, 150 students passed in Account and statistics and 50 students passed in Statistics only. Using venn-diagram and necessary set notations find the number of students. i. Passed in at least one subject ii. Passed in all three subjects iii. Passed in Economics only iv. Passed in Account only.