戴維斯 發表於 2004-9-17 23:26:39

probability

有條數唔識計
a set of toy consists of a board with 4 holes and 4 cubes.The holes and cubes are numbered 1,2,3,and 4 respectively.A baby places a cube in each hole at random.Find the probability that
a)every cube is in the wrong hole

the answer is 9/24
唔該我想問唔用tree diagram 用數式可以點計

截拳道小子 發表於 2004-9-18 00:58:10

所有可能性減去所有可以相同既機會率(4個,3個,2個,1個)........應該會容易d :o

Raul 發表於 2004-9-18 09:50:44

所有可能性減去所有可以相同既機會率(4個,3個,2個,1個)........應該會容易d :o
你係既話就答埋佢啦 :o

截拳道小子 發表於 2004-9-18 15:56:26

你係既話就答埋佢啦 :o
費時打咁多野
Maths 要自己計下好 :o

Raul 發表於 2004-9-18 18:08:28

費時打咁多野
Maths 要自己計下好 :o
妖
係既話就唔洗問啦 :icon032:

1-??
邊個諗唔到? :icon101::icon101::icon101:

截拳道小子 發表於 2004-9-18 18:18:01

妖
係既話就唔洗問啦 :icon032:

1-??
邊個諗唔到? :icon101::icon101::icon101:
:icon083:
諗到佢就唔洗問啦
咁易 :o

Raul 發表於 2004-9-18 18:21:51

:icon083:
諗到佢就唔洗問啦
咁易 :o
咁佢問就係想人地幫佢做埋丫麻 :o
唔要得 :icon032::icon032::icon101:

截拳道小子 發表於 2004-9-18 18:29:13

咁佢問就係想人地幫佢做埋丫麻 :o
唔要得 :icon032::icon032::icon101:
你講左出黎 :o

Raul 發表於 2004-9-18 18:30:03

你講左出黎 :o
我把口唔密的 :o
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