# Recent questions tagged easy

1 vote
$P, Q, R$ and $S$ are to be uniquely coded using $\alpha$ and $\beta$. If $P$ is coded as $\alpha \alpha$ and $Q$ as $\alpha \beta$ , then $R$ and $S$, respectively, can be coded as ________. $\beta \alpha \:\text{and}\:\alpha \beta$ $\beta \beta \:\text{and}\:\alpha \alpha$ $\alpha \beta\:\text{and}\:\beta \beta$ $\beta\alpha \:\text{and}\:\beta \beta$