Hats Blown Off

Ten people, each wearing his own hat, are crossing a desert when suddenly a gust of wind blows and all the hats were blown off. That time a boy happens to cross nearby and he takes out all the hats and return to them. Now the question is what is the probability of exactly nine hats being returned to the right persons? (i.e) returning the hats to its original owners?


Answer:

The probability is Zero. If exactly 9 hats are returned to them correctly, so must be the 10th hat to the 10th person. It is not a question of probability; or rather, a certainty. There is no mathematics involved here; just a mere commonsense; that's all.