Question

A rectangular box of lines and an extra vertical line near the right end of the box has circles with X's in them on the right side, on the extra line, and on the top side between the extra line and a stack of vertical lines near the left end. The top circle is A. The right side circle is C. The circle on the extra line is B. The bottom side has 2 small circles separated by a short segment of the side near the left end. The top side has a stack of short horizontal lines labeled A in its middle, which are from left to right short, very short, short, very short.
Use the diagram to answer each question with yes or no.

If you removed bulb A, would bulbs B and C continue to shine?

If you removed bulb B, would bulbs A and C continue to shine?

Answer 1

If A is removed: No — removing A breaks the only series path, so B and C go out.

If B is removed: Yes — B and C are in parallel, so removing B leaves the path through C (and A) intact, so A and C still shine.