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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? |
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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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