three friends Abbie,Boobie and Cillie orderd a jazz,country and classical CD respective.The three CD's were delivered,one to each of the three fried,but none got the correct CD.(a)Determine the number of ways in which this might occur.(b)they were jo

three friends Abbie,Boobie and Cillie orderd a jazz,country and classical CD respective.The three CD's were delivered,one to each of the three fried,but none got the correct CD.(a)Determine the number of ways in which this might occur.(b)they were jo
three friends Abbie,Boobie and Cillie orderd a jazz,country and classical CD respective.The three CD's were delivered,one to each of the three fried,but none got the correct CD.
(a)Determine the number of ways in which this might occur.
(b)they were joined by Doobie(who wanted a rock CD)in placing their next order.Again all four received one of the CD's orderd but again all got the wrong CD.Determine the number of ways in which this might have occurred.
(c)Before inviting pop lover Eobbie to join them the four friends decided to see in advancce what sort of risk they would be taking.they decided to construct a recurrence relation!
taking W5 to be the number of ways that all five would receive the wrong CD,express w5 in term of W4 and W3 and hence determine W5.

three friends Abbie,Boobie and Cillie orderd a jazz,country and classical CD respective.The three CD's were delivered,one to each of the three fried,but none got the correct CD.(a)Determine the number of ways in which this might occur.(b)they were jo
(a)2
(b)9
(c)w5=4(w3+w4)

三个朋友Abbie,Boobie 和 Cillie 分别订购了一张爵士乐、乡村音乐和古典音乐的CD。这三张CD分别被送到了这3个人的手中，每人拿到一张，而且每个人拿到的都不是想要的的那张
（a）写出可能发生的情况的数目
2种【分别列出可能情况再数】
（b） Doobie（想要摇滚乐）加入了他们，是在他们后面订购的。这次4张CD分别被送到了这4个人的手中，每人拿到一张，而且每...

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三个朋友Abbie,Boobie 和 Cillie 分别订购了一张爵士乐、乡村音乐和古典音乐的CD。这三张CD分别被送到了这3个人的手中，每人拿到一张，而且每个人拿到的都不是想要的的那张
（a）写出可能发生的情况的数目
2种【分别列出可能情况再数】
（b） Doobie（想要摇滚乐）加入了他们，是在他们后面订购的。这次4张CD分别被送到了这4个人的手中，每人拿到一张，而且每个人拿到的都不是想要的的那张，写出可能发生的情况的数目
【依此类推】
（c）在邀请流行音乐爱好者Eobbie加入他们之前，这4个好朋友决定提前看一下他们将冒多大的风险。他们决定找出可能发生情况的数目与人数间的递进关系
用W5作为5个人都拿不到自己想要CD可能发生的情况的数目，用W4和W3表示W5，从而确定W5

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三个朋友Abbie,Boobie 和 Cillie 分别订购了一张爵士乐、乡村音乐和古典音乐的CD。这三张CD分别被送到了这3个人的手中，每人拿到一张，而且每个人拿到的都不是想要的的那张