In a certain code, TRAPEZIUM is coded as RTPAEIZMU. How will RECTANGLE be written in that code?

ERTCAGNEL

The correct answer is Option (3) → ERTCAGNEL

First, observe the coding pattern:

TRAPEZIUM → RTPAEIZMU

Split the word into positions:

T R A P E Z I U M
1 2 3 4 5 6 7 8 9

Rule observed:

• Swap 1st & 2nd
• Swap 3rd & 4th
• 5th letter remains unchanged
• Swap 6th & 7th
• Swap 8th & 9th

Now apply the same rule to RECTANGLE:

R E C T A N G L E
1 2 3 4 5 6 7 8 9

After applying the rule:

• RE → ER
• CT → TC
• A → A
• NG → GN
• LE → EL

So the coded form is: ERTCAGNEL