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A box contains same size of 27 cards: Of...

A box contains same size of 27 cards: Of these some are green and some are yellow A card is taken from the box, without looking into ịt, if the probability of the card become green is `1/3`
a) What is the number of green cards?
b) If a green card and 2 yellow cards are put in the box and a card is taken without looking into it What is the probability of it being green?

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