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Are we looking for a heavy weight or light weight ball? I am assuming light weight here.
- theeran September 16, 2015Minimum number of times to find the ball that is not equal weight is 2
Make two groups of 3 balls and one group of 2 balls
For e.g.
Group 1 and Group 2 has 3 balls
Group 3 has 2 balls
a) Weigh Group 1 and Group 2
b) If Weight (Group1) == Weight(Group2) then Group3 has the light weight ball
b1) Weight balls in Group3 to find the light weight ball
c) Else either Group1 or Group2 has the light weight ball
c1) Choose two balls from light weight group and weigh again
c11) If Weight(ball1) == Weight(ball2) then left out ball (Ball3) is the light weight ball
c12) Else either ball1 or ball2 is the light weight ball
So, the minimum number of times to use a scale is 2 times - using three-group technique.