Charlie has 4 red buttons, 3 blue buttons, 7 green buttons, and 5 yellow buttons in his pocket.

What is the probability Charlie will reach in his pocket and pull out a red button?

First u wanna know how many buttons there are total so you would take 4 + 3 + 7 + 5 = 19. your denominated (number on the bottom of the fraction) is 19! the number that goes on the top is the number of red buttons ... 4. your final answer is 4/19.

The probability is 4/19 or. 21