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09-02-2018
Mathematics

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From a standard deck of playing card, a card is selected from random. what is the probabilty that the card selected is a black card or a 4?

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Аноним Аноним

10-02-2018

A deck has 52 cards
A deck has 25 black cards.
A deck has 4 "4" cards but 2 of them are black, therefore 2 red
P(black or 4) = (25 + 2) / 52 = 27/52

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