probability

戴維斯

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

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

Raul

[QUOTE=截拳道小子]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 [/QUOTE]
你係既話就答埋佢啦

截拳道小子

[QUOTE=Raul]你係既話就答埋佢啦 [/QUOTE]
費時打咁多野
Maths 要自己計下好

Raul

[QUOTE=截拳道小子]費時打咁多野
Maths 要自己計下好 [/QUOTE]
妖
係既話就唔洗問啦

1-??
邊個諗唔到?     

截拳道小子

[QUOTE=Raul]妖
係既話就唔洗問啦

1-??
邊個諗唔到?     [/QUOTE]

諗到佢就唔洗問啦
咁易

Raul

[QUOTE=截拳道小子]
諗到佢就唔洗問啦
咁易 [/QUOTE]
咁佢問就係想人地幫佢做埋丫麻
唔要得     

截拳道小子

[QUOTE=Raul]咁佢問就係想人地幫佢做埋丫麻
唔要得     [/QUOTE]
你講左出黎

Raul

[QUOTE=截拳道小子]你講左出黎 [/QUOTE]
我把口唔密的