Hi, Everybody,

Since I am having quite a few interviews recently. I like to share with you the toughest question, just to prepare yourself for future interviews, or as a brain teaser.

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Question:
General Manager of a good company is trying to hire one executive assistant. among the 100 applicants, they picked the smartest 3 through the first round of screening.

To determine which one will get the job, General manager invited 3 ladies to his office. He showed 5 cards to them. 3 cards are blue, and 2 are white.

He said: "Now I am going to pin one card on the back of each of you." And he pinned one blue card to each lady's back, then he hided the 2 white cards in his drawer. "Now, all of you can see the color of the cards on others' back. But I want you to tell me what color is the card on your own back."

All 3 ladies suspect that they got a blue card on the back. But they just cannot give a valid reasoning... 30 minutes passed. Finally one lady stood up, and said -- "I have a blue card on my back!" Then she gave a very valid reasoning.

Now can you tell me what's the valid reasoning to reach here conclusion?