Q. 423.8( 4 Votes )

An urn contains 7

Answer :

given: urn containing 7 white, 5 black and 3 red

formula:


two balls are drawn at random, total possible outcomes are 15C2


therefore n(S)=18C2=105


(i) let E be the event that both balls are red


n(E)= 3C2=3




(ii) let E be the event that one is red and other is black


n(E)= 3C15C1=15




(iii) let E be the event that one ball is white


n(E)= 8C17C1=56




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