If the tourist wants to visit four monuments only and we are given that the tourist does not visit a certain monument (call it X), and we are able to find out all four monuments he does visit. Which of these is monument X?

Red fort

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Qutub Minar

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Jantar Mantar

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Humayun's tomb

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Solution

The correct option is B Qutub Minar
If the tourist does not visit Qutub Minar, he will not visit Lotus Temple, Akshardham or Ugrasen ki Baoli either (from the first condition) and will not visit Red Fort also (from the converse of the second condition). Only 4 monuments are left, and the tourist must visit all of them.
Thus, we can determine all 4 monuments on the tourist's itinerary if we are told that he does not visit Qutub Minar. This is not possible for any of the other answer options. Thus, X corresponds to monument Qutub Minar.

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