Total amount of marbles:
17 + 7 + 4 = 17 + 11 = 28
Amount of marbles that are either orange or pink:
17 + 7 = 24
To find the probability that the marble is pink or orange, we divide the amount of orange and pink marbles by the total amount:
P = 24/28 = 6/7
So the answer is A. 6/7