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Numerical Ability
Permutation and Combination
In how many different ways can 5 girls and 5 boys form a circle such that the boys and the girls alternate?
Options
1) 2880
2) 1400
3) 1200
4) 3212
Read Solution (Total 6)
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- the answer is 2880
explanation : since in circular permutation no. of ways person can be arrange is (n-1) !
now suppose the girls are seated in !4 ways now there are 5 spaces created (try to visualise ) now these can be filled in !5 ways so the ans is !4*!5=2880 - 9 years agoHelpfull: Yes(6) No(0)
- 5!*5!*2=2880
- 9 years agoHelpfull: Yes(3) No(1)
- possible orders of boys and girls:
5*4*3*2*1=120 ways for boys
5*4*3*2*1=120 ways for girls
120*120=14400(B G B G B G..)
120*120=14400(G B G B G B..) like that
The total possible arrangements is:
14400+14400=28800 - 9 years agoHelpfull: Yes(1) No(2)
- 4!*5!=2880
- 9 years agoHelpfull: Yes(0) No(0)
- 4!*5!=2880
- 9 years agoHelpfull: Yes(0) No(0)
- 28880 is right ans
- 9 years agoHelpfull: Yes(0) No(1)
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