In the following figure, rectangle represents Plumbers, circle represents Bakers, triangle represents Jugglers and square represents Joggers. Which set of letters represents Plumbers who are either Bakers or Jugglers?

Let's map the shapes to the respective professions based on the question description:
Rectangle = Plumbers

Circle = Bakers

Triangle = Jugglers

We need to find letters that represent Plumbers (must be inside the rectangle) who are either Bakers (inside the circle) or Jugglers (inside the triangle).

Looking at the intersection region within the Rectangle:

Letter H lies inside the Rectangle and the Triangle (Plumbers who are Jugglers).

Letter E lies inside the Rectangle, Circle, and Triangle (Plumbers who are both Bakers and Jugglers, which satisfies the condition).

Letter G lies inside the Rectangle and Circle (Plumbers who are Bakers).

Combining these sets gives the group H, E, G.