Question : Directions: In a certain code language, rocket aeroplane sky stars is written as ci pi di ki, satellite moon sun sky is written as ni ci ui li, sky sun stars mars is written as ui gi ki ci and venus aeroplane moon planet is written as di qi mi ni. How is rocket written in the given language?

Option 1: ci

Option 2: ki

Option 3: pi

Option 4: di

Correct Answer: pi

Solution : Given:
1. rocket aeroplane sky stars ⇒ ci pi di ki
2. satellite moon sun sky ⇒ ni ci ui li
3. sky sun stars mars ⇒ ui gi ki ci
4. venus aeroplane moon planet ⇒ di qi mi ni

By comparing all the three coded sentences, we find that –
In sentences 1 and 4, the common word is aeroplane ; the common code is di
In sentences 1, 2, and 3, the common word is sky ; the common code is ci
In sentences 1 and 3, the common word is stars ; the common code is ki
In sentences 2 and 4, the common word is moon ; the common code is ni
In sentences 2 and 3, the common word is sun ; the common code is ui
The remaining words and code in sentence 1 are rocket and pi; in sentence 2 are satellite and li ; in sentence 3 are mars and gi ; in sentence 4 are venus / planet and qi / mi
Finally, aeroplane ⇒ di; sky ⇒ ci; stars ⇒ ki; moon ⇒ ni; sun ⇒ ui; rocket ⇒ pi; satellite ⇒ li; mars ⇒ gi; venus/ planet ⇒ qi/ mi

Therefore, the code for rocket is pi . Hence, the third option is correct.