math
posted by Andrzej .
Two cards are drawn without replacement from a standard deck of 52 cards. Find the probability a) both cards are red ,b) both cards are the same color, c) the second card is a king given that the first card is a queen, d) the second card is the queen of hearts given that the first card is black

prob both red = (26/52)(25/51) = 25/102
prob both same colour
= 25/102 + 25/102 = 50/102 = 25/51
prob (queen then king) = (4/52)(4/51) = 4/663
prob( black then queen of hearts) = (26/52)(1/51) = 1/102
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