A piano has 52 white keys that occur in a repeating pattern of ABCDEFG. The first white key is $\mathrm{A}$. What letter is associated with the $33^{\text {rd }}$ white key?
(A) A
(B) B
(C) $\mathrm{C}$
(D) $\mathrm{D}$
(E) E
The repeating pattern of $\mathrm{ABCDEFG}$ has 7 white keys.

Since the first white key is A, the pattern repeats after each number of keys that is a multiple of 7 .

Since 28 is a multiple of 7 , then the $28^{\text {th }}$ white key is $\mathrm{G}$ and so the $29^{\text {th }}$ white key is A, the $30^{\text {th }}$ white key is $\mathrm{B}$, the $31^{\text {st }}$ white key is $\mathrm{C}$, the $32^{\text {nd }}$ white key is $\mathrm{D}$, and the $33^{\text {rd }}$ white key is $\mathrm{E}$.

ANSWER: (E)