A bag has 5 white marbles, 8 red marbles, and 4 purple marbles. If we take a marble randomly, then what is the probability of not getting purple marble?

None of these

Total marbles = 4+8+5= 17 Purple marbles = 4

Not getting purple marble i.e getting only white or red marbles

⇒ P(not getting purple marble) = $\frac{\text{getting only white or red marbles}}{\text{Total number of marbles}}$ = 13/17