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we have a deck of 8 cards numbered from 1 to 8 . some are grey and some are white. the cards numbered 5, 6, 7 and are grey. the cards numbered 1, 2,3 , 4, and 8 are white. a card is drawn at random. let be the event that the drawn card is grey, and let be the probability of . let not be the event that the drawn card is not grey, and let not be the probability of not .