A card is chosen at random from a deck of 52 cards. What is the probability that a heart or spade is chosen?

One card is chosen out of a deck of 52 cards. There are 13 Spades, Hearts, Diamonds and Clovers each. So 13 spades and 13 hearts makes 26 of the total. 26/52=0.5=50%

There is a 50-50 chance of a heart or spade being chosen.