Hi,

(8 of the large marbles are green and 8 of the small marbles are white)

A box contains 15 LARGE marbles(8G,7W) and 18 small marbles(8w,10g).  in ALL

marble is randomly selected from the box

P(large or white) =  P(LARGE) + P(white) - P(BOTH)= 15/33 + 15/33 - 7/33 

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