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Logic Level 3

There was a depository of gold bars at the centre of a blank vault,which was protected by seven concentric,concrete walls with exactly one door in each wall.Each door was protected by a guard.One day,a man made a deal with the first guard,which allowed him to pass on the condition that he would give the guard half of the gold bars that he was carrying with him. However, the guard was required to return one gold bar to him.He made the same deal with the remaining guards at each door.How many gold bars should he have originally taken if he ended up getting two for himself?

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