4. Beatrix looks at the word JUNIOR in a mirror.
How many of the reflected letters never look the same as the original, no matter how Beatrix holds the mirror?
A 1
B 2
C 3
D 4
E 5
Solution: $\mathbf{C}$
The letters $\mathbf{J}, \mathbf{N}$ and $\mathbf{R}$ do not have an axis of symmetry. So these letters cannot look the same when reflected in a mirror, however the mirror is held. The letters $\mathbf{U}, \mathbf{I}$ and $\mathbf{O}$ all have at least one axis of symmetry. So each may look the same when reflected in a mirror.