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?
Correct answer: A
Explanation
First table =1
Second table=2
Third table=3
Fourth table=4
since only 4 person can sit on a table hence no other arrangement is done
so total no of table occupied is 4
no of table left unoccupied is (10-4)=6
A
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