self Maths Puzzle

In the reading room of a library, there are 10 tables, 4 chairs per table. In each table there are different numbers of people seated. How many ways they will sit in the library so that no chair would be blank?

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self Other Question

Maximum and minimum number of intersecting points between 4 circles drawn in a plane are The quotient of the least common multiple of the first 36 natural numbers divided by the least common multiple of the first 33 natural numbers is