- Paulo keeps 5 pens of either blue or black ink in his backpack. At the beginning of each class, Paulo randomly selects a pen from his backpack without looking and replaces it at the end of each class. If he has randomly selected a blue pen 39 times out of 100, which is the most likely number of blue pens in Paulo's backpack? A. 3
B. 1
C.4
D.2