3. Find the Fake (Counterfeit) Coin set ?
There are 5 sets of coin (10 coins in each set). All coins weight 25gms (say) each except the coins in one set which weigh 2gm more (each). You have a digital weighing machine which can be used only once.
How do you determine which set of 10 coins is of higher weight?
Note: Basic assumption holds good.
Read it and post your answers as reply to the post. I will be adding my answer if there are no correct answers after 10 replies.