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You have 8 balls. One of them is defective and weighs less
than others. You have a balance to measure balls against
each other. In 2 weighings how do you find the defective one?
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Answer Posted / aby
Firstly we take 4 balls, placing 2 on each pan of the
balance & check which pan goes up(1st weighing). If no
change it means the balls don't contain the defective
one,therefore the other Group of 4 balls contain the
defective
ball,Now if one of the pan goes up,it means it contains the
defective ball(out of 2 balls).We select these 2 & unload
the pans. Now we keep 1 ball(from the selected
balls)on either side of the balance & weigh(2nd weighing).
One of these two will be the defective one otherwise it
must b in the second group of balls.
| Is This Answer Correct ? | 3 Yes | 11 No |
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