A class is composed 2 brothers and 6 other boys. In how many ways can all the boys be seated at the round table so that the 2 brothers are not seated besides each other?
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The two brothers can be seated in 3ways
let A and a are the 2brothers and B,C,D,E be the other students in the class
orders :
1.ABaCDE
2.ABCaDE
3.ABCDaE
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