Question 365753

here we have to find no. of groups in which at least one girl 
 
i.e from total no. of groups discard those groups in which only boys.



no. of ways to selecting 4 from total 22 =  22C4


no. of ways to selecting 4 boys from total 10 boys = 10C4 



total possible ways = 22C4  - 10C4  = 7315 - 210 = 7105



answer is: 7105



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