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

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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

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 I have three friends.对three提问. 英语翻译Abbie is a lovely rabbit.She lives with three gunea pigs and loves to clean them every day.She runs around my house like a little dog.She loves to climb up the furniture and sit there.Abbie likes bananas best.When she is chewing one,her m 翻译：studied with more than three friends? write three sentences about your friends 英语填空 I have three c__ friends 对大写部分提问 she has THREE friends. My friends visited the museum ____nearly three hours. I have three good friends.Them like sports改错RT 连词成句three,have,i,friends,new,怎么连 一道英语选择题：We friends since three years ago. I have three new friends.变为一般疑问句 Jack has three friends.Mike is the of the four. I recruited three of my friends to help me move. I was handing out with three friends是什么意思 ABBYABBIE(Abby abbie)Melody、Helen、Debbie、Lisa、Yvonne哪个好听? he meets his friends three times a month ---------------------------对划线提问____ ____ ___he___his friends? he meets friends /three times a month/对three times a month提问