What is the possibability of picking an odd number from a pack of cards?

In a standard deck of 52 playing cards, there are 26 odd-numbered cards (Ace, 3, 5, 7, 9 from each of the four suits). Therefore, the probability of picking an odd number from a pack of cards is the number of odd cards divided by the total number of cards, which is 26/52. This simplifies to 1/2, or 50%.