TCS Company Numerical Ability Time Distance and Speed

15 students join a summer course. Every day 3 students are on duty after school to clean the class rooms. After the course, it was found that every pair of students has been on duty exactly once. How many days does the course last for?
a) 35 b) 45 c) 105 d)none of these

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TCS Other Question

in which of the system,decimal number 194 is equal to 1234? If the sum of the numbers in each row column, diagonal are same then find the value of (Y+Z)
V
-16
W
-2
X
Y
5
Z
-9