A card is drawn at random from a well-shuffled deck of playing cards. Find the probability that the card drawn is either a king or a queen.
Let S be the sample space of drawing a card from a well-shuffled deck.
There are 4 king and 4 queen cards in a deck.
So there are 4 4 =8 cards which are either king or queen.
a card which is either a king or a queen can be drawn in ` ""^8C_1=8`
Probability of drawing a card which is either a king or a queen=8/52=2/13