You randomly select a card from a 52-card deck. Find the probability of selecting a 4 or a 9.
There are 4 cards with the number 4 (4 of hearts, 4 of diamonds, 4 of clubs, 4 of spades) and 4 cards with the number 9 (9 of hearts, 9 of diamonds, 9 of clubs, 9 of spades) in a 52-card deck.
So, there are a total of 4 + 4 = 8 favorable outcomes (cards with the number 4 or 9) out of 52 possible outcomes (all the cards in the deck).
The probability of selecting a 4 or a 9 is given by:
Probability = Number of favorable outcomes / Number of possible outcomes
= 8 / 52
= 2 / 13
So, the probability of selecting a 4 or a 9 is 2/13.