Q. 5 boys and 3 girls are to be arranged around a circular table such that B1 and G1 do not sit together. What I did was Total ways to arrange - Total ways in which B1 and G1 are together. i.e. 7!-6!(2!) But the answer is 5!*6!. What am I doing wrong?

Question

Arun · Answer

Rule for Circular Permutations -

(n - 1)! = Clockwise + Anticlockwise arrangement.

Ex. Seating arrangement of persons round a table.

- wherein

DISTINCT arrangement.

Number of ways = Total - when B1 and G1 sit together

Total ways to seat 8 people on table = 7!

When B1 and G1 sit together $=6!\times 2!$

Number of ways $=7!-2\times 6!=6!(7-2)=5\times6!$

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Q. 5 boys and 3 girls are to be arranged around a circular table such that B1 and G1 do not sit together. What I did was Total ways to arrange - Total ways in which B1 and G1 are together. i.e. 7!-6!(2!) But the answer is 5!*6!. What am I doing wrong?

Q.
5 boys and 3 girls are to be arranged around a circular table such that B1 and G1 do not sit together.

What I did was
Total ways to arrange - Total ways in which B1 and G1 are together.

i.e. 7!-6!(2!)
But the answer is 5!*6!.

What am I doing wrong?

1 Answers

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