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Question

One card is drawn from a pack of 52 cards, each of the 52 cards being equally likely to be drawn. Find the probability that the card drawn is either red or king


Solution

Total cards $$ \mathrm{n}(\mathrm{S})=52 $$
There are 26 red cards in a pack and two black kings $$ n(B)=26+2=28 $$. 
$$ P(B)=\dfrac{n(B)}{n(S)}=\dfrac{28}{52}=\dfrac{7}{13} $$

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