Final answer:
Removing some of the gas particles from a balloon would result in a decrease in pressure inside the balloon due to fewer particles exerting force on its walls.
Step-by-step explanation:
If you remove some of the gas particles from the balloon, the pressure inside the balloon would decrease. This occurs because pressure is directly proportional to the number of particles in a given volume (as long as temperature and volume remain constant), according to the ideal gas law. With fewer particles to exert force on the walls of the balloon, there would be less frequent and weaker collisions, leading to a lower pressure within the balloon.