Question

One card is drawn from a well-shuffled standard 52-card deck of playing cards. find the probability that the card is a king or the card is red. half of 52 cards are red, half - black. out of 4 kings 2 are red (hearts, diamonds) and 2 are black (spades, clubs).

Answer 1

P(K) = 4/52 = 2/26
P(R) = 26/52 = 1/2
$P(R\cap K)=\frac{2}{52}=\frac{1}{26}$
$P(R\cup K)=P(R)+P(K)-P(R\cap K)=\frac{1}{2}+\frac{2}{26}-\frac{1}{26}=\frac{7}{13}$
The answer is: 7/13

Answer 2

1/2 for red card and 1/13 for king and for a red king 1/26