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what is the probability of getting either a black card or an ace in one draw from an ordinary deck of 52 cards?I got 8/1326/52 black cards + 4/52 aces=8/13the answer that was marked correct is 7/13What did I do wrong?
( 6 / 13 ) + ( 1 / 13 ) = ( 7 / 13 )Can you see why?
There are 13 black spades (including the ace of spades), 13 black clubs (including the ace of clubs), the ace of diamonds, the ace of hearts,= 13 + 13 + 1 + 1 =2828/52 = 7/13Thanks
Last edited by OzMark (2013-06-12 23:10:28)
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