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JEE Main Mathematics question

MathematicsPermutations and CombinationsJEE Main

Number of permutations of and taken all at a time are such that the digit appearing somewhere to the left of , appearing to the left of and somewhere to the left of , is then the value of is

Answer: 9

Solution

There are permutations; in each of the pairs , , exactly half the arrangements have the smaller digit

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Question ID VK-020730