from an ordinary deck of 52 cards, a single card is selected random. what is the probability that it is a 10 or red card?

Answer 1

prob(10 or red)
= prob(10) + prob(red) - prob(10 AND red)
= 4/52 + 26/52 - 2/52
= 28/52
= 7/13

Answer 2

From an ordinary deck of 52 cards, a single card is selected random. What is the probability that it is a 10 or red card?

= prob(10) + prob(red) - prob(10 AND red)
= 4/52 + 26/52 - 2/52
= 28/52
= 7/13

So, the answer is 7/13.
Credits go to Reiny for helping.