TS Police SI Mains 2018 Paper 3

Question : 81 of 200

Marks: +1, -0

A person put one coin at 1'O clock, two coins at 2'O clock, 3 coins at 3'O clock and so on, in a box. Then the number of coins he has put in the box between 6.30 AM and 6.30 PM in a day is