12 balls of equal Wt.EXCEPT ONE is given to u with the BALANCE find the differing ball u have 3 chance to use?

Question

12 balls of equal weight except one are given to u with a balance. find the weight of the differing ball by using the balance scale. you can use the balance scale only for 3 times. You will have to also the ball which is different in weight form others is lighter or heavier. please answer

Answer 1

For this puzzle to work you need to know if the odd ball is lighter or eavier than the others.
The trick id to divide the ball in two groups and weigh them.
One side of the scale will go up and the other will go down.
Without knowing if the odd ball is lighter or eavier you dont'know if the the plate that rise has the lighter ball or if the plate that lower has the eavier ball and you are back to square one.
Let say that the odd ball is eavier,when you use the scale the plate with the eavier ball will go down.Discard the six balls that went up.(1)
Take three balls of those remaining and weigh them.
Again one of the plate will go up and the other down.(2)
Discard the three balls that went up.
Take two of the remaing balls and weigh them.(3)
If one plate goes down,that's the eavier ball,if the scale remain even,the third ball is the eavier one.

Answer 2

For starters, usually they will only have to hit a maximum of two serves. Of course they hope that they get their first serve in, but they keep a second ball in their pocket in case they have to hit a second serve. They don't want to unnecessarily keep a third ball in their pocket while they play the point, because it can be distracting and not feel normal. So far as the selection criteria goes, they have to weed out one ball, so they try to find the ball that has a defect, like a really fuzzy spot or a spot where the fuzz has come off or if something is stuck to the ball like pieces of clay. Defects like that can affect how the ball bounces. Hope this helps!