P, Q, R and S are to be uniquely coded using $\alpha$ and $\beta$. If P is coded $\alpha\alpha$ and Q is coded $\alpha\beta$, then R and S, respectively, can be coded as ______.
Correct answer: (D) $\beta\alpha$ and $\beta\beta$
Explanation
Two positions and two symbols give four codes: αα, αβ, βα, ββ. P and Q already use the first two. R and S must use the remaining two without repetition, which is the pair in **D**.
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