Read the passage given and solve the questions based on it.
In the last year’s “Tycoon Contest”, nine teams from different colleges participated. Navneet Anand, the quiz master, asked the nine teams— “I have 9 coins, the ratio of the weight of the coins are same, except one. I give the different numbers to these 9 coins starting from 11 to 19. The team who can find the coin with different weights in the least number of weighings can take that coin and will be the winner.”
Navneet Anand now said that the coin whose weight was different from the rest was the heaviest of the all. What is the minimum number of weighings required to find that coin? Contestant 8 gives the correct answer and his answer is