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JEE Main Mathematics question

MathematicsPermutations and CombinationsJEE Main

Consider the words formed from the letters of word CONSTANT. Let be the set containing words having N together and T together. Let be the set containing words having N and T never together. Find .

Answer: 0

Solution

Defect: "N and T never together" is ambiguous; the source reads it as "none of the four letters is next to another of them", which gives , while reading it as "no is next to a " gives and the difference ; the source reading is used and its key is

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Question ID VK-020874