q no 9 plz solve it
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First select 2 husbands out of the 7 husbands in C(7,2)=21 ways. Keep their wives away and select 2 from remaining 5 women in C(5, 2)ways.
Thefore the number of selections of 2 men and 2 women is 21*10=210
Similar select 2 wives from 7 wives isC(7,2) ways=21
Keep their husbands away and select 2 from remaining 5 in C(52)=10 ways.
The mumber of ways =21(10)=210
Total number of selections=210+210=420
Thefore the number of selections of 2 men and 2 women is 21*10=210
Similar select 2 wives from 7 wives isC(7,2) ways=21
Keep their husbands away and select 2 from remaining 5 in C(52)=10 ways.
The mumber of ways =21(10)=210
Total number of selections=210+210=420
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