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In a certain code $\text{UPGRADE}$ is written as $\text{WNIPCBG}$. How is $\text{DROWN}$ written in that code?

1. $\text{BTMYL}$
2. $\text{BPMYL}$
3. $\text{BTQYL}$
4. $\text{FPQUP}$

We can decode it as:

• $U+2=W$
• $P-2=N$
• $G+2=I$
• $R-2=P$
• $A+2=C$
• $D-2=B$
• $E+2=G$

we start with $+2$ and alternate $-2,+2,-2,+2,\dots$ for each letter. similarly

• $D+2=F$
• $R-2=P$
• $O+2=Q$
• $W-2=U$
• $N+2=P$

Only option $(D)$ matches.

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