Question 6
4 apparently identical coins are given, 3 of which are real and therefore have the same weight; one is false and therefore has different weight. It is not known whether the counterfeit coin is lighter or heavier than the others. Show that it is possible to determine the different currency using only two weighings on a plate balance. Note: In this type of scale, we can compare the weights placed on the two plates, that is, the scale can be balanced or tip towards the heavier side.
