CAT 2018 100

CAT Preparation Community 8y ago

There are nine identical looking balls, out of which exactly eight balls are of equal weight and the remaining ball is defective in terms of weight.W hat is the minimum number of times one will have to use the pan balance to exactly locate the defective balls and whether its heavies or lighter as compared  to other eight balls 

please answer

if I am solving according to the explanation that is given in the video solution my answer is coming out to be wrong, please help