Question

If you randomly select a card from a well-shuffled standard deck of 52 cards, what is the probability that the card you select is a 7 or 3? (Your answer must be in the form of a reduced fraction.)

Answer 1

There are four 7s and four 3s in a deck.

$$P(7s\cup 3s)=\dfrac{4+4}{52}=\dfrac{2}{13}$$