Solved UPSC CDS/OTA Question
A solved UPSC CDS/OTA PYQ — decoded step-by-step.
Solve it the standard way once — then learn the shortcut.
Q · Number systemEasy · 45s
Find the HCF of 72 and 108.
TopicNumber system
Question Typemultiple choice
DifficultyEasy
Marking+1 / −0.33
Test Duration30 min
Q 1 / 30Next question →
Step-by-Step Solution
The complete worked solution.
Every step explained — no skipped algebra.
Solve step-by-step using number system concepts. Find the HCF of 72 and 108. → 36
Final Answer: Option C — 36