Hard Puzzle
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Three people are in a room. Ronni looks at Nile. Niile looks at Senthil. Ronni is married but Senthil is not married. At any point, is a married person looking at an unmarried person? Yes, No or Cannot be determined.
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A Queen has twins by Cesarean so it is impossible to tell who was born first. Now the twins are adults and ready to rule. One is stupid, while the other is intelligent. Yet the unintelligent one is chosen as the next ruler. Why?
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The one who has it does not keep it. It is large and small. It is any shape.
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A skin have I, more eyes than one. I can be very nice when I am done. What am I?
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You are standing in front of a room with one light bulb inside of room. You cannot see whether it is on or off. Outside the room there are three switches in the off positions. You may turn the switches any way you want to. You stop turning the switches, enter the room and know which switch controls the light bulb. How?
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I have three feet, but can’t walk;
I tell you things, but can’t talk;
Sometimes I bend but, I am mostly straight.
I am like a scale but, can’t tell your weight.
What am I ?
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It reaches for the sky, but clutch to the ground; sometimes it leave, but it is always around.
What is it?
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Given a chess board of N * N, we have to put only rooks on chess board we wants to place some rooks on the chessboard in such a way that the following conditions are satisfied:
- Each square of the board contains at most one rook.
- There are no four rooks forming a rectangle.
- Formally, there should not be any four valid integers r1,c1, r2, c2 (r1≠r2,c1≠c2) such that there are rooks on squares (r1,c1), (r1,c2), (r2,c1) and (r2,c2)
- The number of rooks is at least 8N
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