Answer:
There are two method of comparing the balls 1) using a balance 2) by only 2 weighings.
Explanation:
There are two method of comparing the balls 1) using a balance 2) by only 2 weighings.
Make the following groups - --- (1,2,3),(4,5,6),(7,8)
Step 1. compare the Weigh (1,2,3) and (4,5,6)
there are 2 possible outcomes:
1---both the group are of same weight. and named as (Case A)
2--- one of the group is heavier than other and named as (Case B)
Step 2. Let examine both case
In Case A --in this case, now compare the weight of 7th and 8th ball. By this you have recognize the heavier ball by 2 weighing method.
In Case B -- considered the heaviest group (assume group (1,2,3) is heavy), from this group take randomly two ball and compare the their weight. out of these two ball, one is heavy else the third ball is.
