Question

two cards are drawn from a pack of 52 playing cards what is the probability that either both are black or both are can Kings

Answer 1

Black cards = 13 + 13 = 36

Total Kings = 4

P (A black card or a king) = 26 + 2 divided by 52 (we are taking kings as 2 because the black deck contains 2 kings. so 4 - 2 = 2)

= 28 / 52

= 14 / 26 = 7 / 13


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Answer 2

probability of drawing two cards from Pack of 52 = 52c2 = 52×51/2= 1326
probability of drawing two black cards = 26c2= 26×25/2= 325
probability of drawing two kings is 4c2=
4×3/2= 6
toal probability = 325+6-1/1326= 55/221