(a) the total number of possible arrangements for the row;
(b) the total number of arrangements in which all the boys are not seated together.
Three boys and four girls are to be seated in a row. Find?
2016-12-27 10:11 pm
回答 (1)
2016-12-28 7:44 am
✔ 最佳答案
Three boys and four girls are to be seated in a row. Find?(a) the total number of possible arrangements for the row;
Sol
7!=5040
(b) the total number of arrangements in which all the boys are not seated together.
Sol
3!=6
6*(1+4)!=720
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