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 Problem: one card is drawn at random from a pack of 52 cards. What is the probability that the card is drawn is either a red card or a king [ Calculator, Method and examples ]Solution:Your problem -> one card is drawn at random from a pack of 52 cards. What is the probability that the card is drawn is either a red card or a kingTotal number of ways of drawing 1 cards from 52 cardsn(S) = 52Let E = event of getting 1 card is red or king Total number of red cards = 26Total number of king cards = 4Total number of cards which are both red and king = 2Hence, n(E)= number of ways of drawing 1 red from 26 or 1 king from 4 :. n(E)={::}^26 C_1+{::}^4 C_1-{::}^2 C_1=26+4-2=28:.P(E)=(n(E))/(n(S))=28/52=7/13

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