<PRE><B>Question 1204306</B>


We  use the formula of combinations nCr where  n  represents the total number of items and r
 is the number of items taken at the time

First group 4 people from the 10  
C(10,4)=210
Second group 3 from balance (10-4)=6 
C(6,3)=20 

Third group 3 from  3 , 1 group

Total ways = 210 * 20 = 4,200 ways.




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