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A shelf has books with different colored covers; 5 are blue; 6 are red; 1 is orange; 3 are white
and 1 is blue and white. What is the probability of choosing a book that has either orange or white on its cover?
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"Either orange or white" means "orange or white, but not both at the same time".
Therefore, the calculation is as follows
P = = . ANSWER
Solved.
" Either . . . or " is called " OR exclusive " as opposite to simple " or ", which is " OR inclusive ".