Hi,

A password is 3-character long which only consists of upper case letters from A to N inclusively. letters in all

each upper case letter cannot be used more than once. 

the number of different passwords that can be created is: 



(b)A box contains four red, three black and two white balls. ({{9}}} balls in all, 6 not black)

Three balls are randomly drawn without replacement. 

A little unclear how many of the balls are black other than the third

 P( ONLY the third ball is black) = 

 

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