The prime ministerA,B,C,D,E,F and G of 7 countries will address at a summit meeting.
(a) Find the number of arrangements that can be made so that
( i ) A will speak before C,
( i i ) A will speak before C and C before E.
(b) In how many of those ways in (a)( ii )will Cspeak immediately after A?
數學與統計
2007-09-16 3:48 am
回答 (1)
2007-09-16 4:28 am
✔ 最佳答案
a(i) 1/2(7!) = 2520(ii) 1/6(7!) = 840
b 1/2(6!)
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