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A special deck of cards has 3 blue cards, and 7 orange cards. The blue cards are numbered 1, 2, and 3. The orange cards are numbered 1, 2, 3, 4, 5, 6 and 7. The cards are well shuffled and you randomly draw one card.
B = card drawn is blue
O = card drawn is odd-numbered
a. How many elements are there in the sample space?
b. P(B) =
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