One card is selected from a deck of cards. Find the probability of selecting a red card or a queen.
To find the probability of selecting a red card or a queen, we need to add the probabilities of selecting a red card and a queen and then subtract the probability of selecting a red queen.
There are 26 red cards in a deck of 52 cards (half of the deck), so the probability of selecting a red card is 26/52 or 1/2.
There are 4 queens in a deck of 52 cards, so the probability of selecting a queen is 4/52 or 1/13.
There are 2 red queens (the queen of hearts and the queen of diamonds), so the probability of selecting a red queen is 2/52 or 1/26.
We can now calculate the probability of selecting a red card or a queen:
P(red card or queen) = P(red card) + P(queen) - P(red queen)
= 1/2 + 1/13 - 1/26
= (13/26) + (2/26) - (1/26)
= 14/26
= 7/13
Therefore, the probability of selecting a red card or a queen is 7/13.