How many meaningful English words can be formed with the letters 'ATN' using each letter only once in each words?
A1
B2
C3
D4
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Suppose the first and the second letters of the English alphabet changed places, also the third and the fourth, the fifth and the sixth and so on. In the new alphabet, thus formed which letter would be the 14th letter.
In a college, the Art room, the Library, the Gym, the Labs, the Storerooms, the Staffrooms and the Classrooms are there on seven different floors of the same building. The lowermost floor in the building is numbered 1, the floor above it is numbered 2, and so on till the topmost floor is numbered 7. No other floors are there below the Library, and the Library is immediately below the Gym. Only two floors are there between the Gym and the Classrooms. Both the Labs and the Staffrooms are on even numbered floors. Only three floors are there between the Storerooms and the Art room. The Storerooms are immediately below the Labs. Which of the following is/are there on floor number 4?
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