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AS Level Statistics Question p6

T

therealhamzakhan

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A bag contains 7 orange balls and 3 blue balls. 4 balls are selected at random from the bag, without replacement. Let X denote number of blue balls selected.
I want to find P(X=1) and P(X=2)
Can someone explain to me how it is done please?
Nov 2001 p6 Q7
 
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