Answer
Possible combinations of 3 grills from 5 are:
{(1,2,3), (1,2,4), (1,2,5), (1,3,4),(1,3,5),(1,4,5), (2,3,4),(2,3,5),(2,4,5),(3,4,5)}
Hence 6 out of 10 possible combinations use grill 2, therefore, grill # 2 is the required solution
Work Step by Step
As given in answer
