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JEE Main Mathematics question

MathematicsPermutations and CombinationsJEE Main

Let the words formed by the letters of word OPTS be arranged in dictionary order. The ranks of words SPOT, POTS, STOP and POST are respectively, then evaluate .

Answer: 3

Solution

The letters in alphabetical order are ; count the words before each word. SPOT: first letter are smaller than : ; second letter is smaller than : ; so . POTS: first letter

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Question ID VK-020873