112
aaj mera din aacha ni hai
no. of ways of arranging 3 boys and 3 girls on a round table such that only 2 and any 2 girls sit together
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7 Answers
1i tied two gals togethr so nw u hav 2 gals n 3 guyz
u can make 3 guyz sit in (n-1)! ways ie 2! ways
nw u get 3 gaps usmein gals
3C2 (2!)
so answer cumz out 2 b
3C2(2)! (2)!
1total no. of ways of arranging 6 persons - no. of ways in which all 3 girls sit together - no. of ways in which no girl sit together
3letz group any 2 girlz .............
now there are 5 ppl .........
now keeping the girls fixer totally 3C2(2!)4! ways are possible ..........
NOW KEEPING 3 GIRLS TOGETHER .........
3!(3!) WAYS ARE POSSIBLE ..................
6(4*3*2*1) - (3*3*2*2)
(3*2)(24 - 6)
6(18)
108.......
13no. of ways of arranging 3 boys and 3 girls on a round table such that only 2 and any 2 girls sit together
I am getting 12
4!*2! - 3!*3!=12