how do I solve?

A jar contains 8 red marbles numbered 1 to 8 and 8 blue marbles numbered 1 to 8. A marble is drawn at random from the jar. Find the probability of the given event, please show your answers as reduced fractions, (a) The marble is red. P(red) (b) The marble is odd-numbered. P(odd) (c) The marble is red or odd-numbered. P(red or odd) (d) The marble is blue or even-numbered. P(blue or even)