The below bar graph represents the number of students who qualified in the GATE exam, the GMAT exam, the CAT exam and those who qualified in none of these exams. (Given that there are no students who passed two or more exams.)

The percentage of students who qualified in at least one of the three exams in 2018 was:

72.72%

Number of students who qualified in atleast one of the three exam in 2018

= 10000 + 13000 + 17000 = 40000

Total number of students in year 2018 = 40000 + 15000 = 55000

Required percentage = \(\frac{40000}{55000}\) × 100 = 72.72%