In a standard deck of 52 playing cards, there are 8 cards that are either a 10 or an ace (4 tens and 4 aces). To calculate the probability of drawing one of these cards, we divide the 8 favorable outcomes by the total number of cards (52), resulting in a probability of 8/52, or about 15.38%. This means there’s a 15.38% chance of drawing a 10 or an ace from a shuffled deck. This probability is important in card games like Blackjack, where tens and aces are valuable. Understanding such probabilities can help inform strategies and decisions in games and other situations involving chance.