1.

There Are 2 Brothers Among A Group Of 20 Persons. In How Many Ways Can The Group Be Arranged Around A Circle So That There Is Exactly One Person Between The Two Brothers?

Answer»

fix one PERSON and the brothers B1 P B2 = 2 ways to do so. 

other 17 people= 17! 

Each person out of 18 can be FIXED between the two=18, thus, 2 X 17! x 18=2 x 18!.

fix one person and the brothers B1 P B2 = 2 ways to do so. 

other 17 people= 17! 

Each person out of 18 can be fixed between the two=18, thus, 2 x 17! x 18=2 x 18!.



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