When solving copying-based LR puzzles, first identify the student with only one error — that’s the original source. Then check identical copies (including errors) to trace jigris.
Step 1: Identify Munna’s pattern Munna got exactly 9 out of 10 answers correct. From the final answer key (last row — Sastry), we compare Munna’s row: Sastry:b , d , d , c , b , d , a , c , a , b Munna: b , d , d , c , b , d , a , c , b , b] Only mismatch is at Q9 ⇒ Munna changed this intentionally (as per passage).
Step 2: Find two students who can be jigri to Munna A student’s answer key is copied from either one or two jigri(s). If two: identical ⇒ copied, else blank. Let’s check whose answers closely match Munna except Q9. Niran: b d d c b d a c b b (Only Q9 differs from Sastry) ✔️ Praveen: b d d c b d a c b b ✔️ These match Munna exactly ⇒ Both could be jigri.
Therefore, Munna is the jigri of Niran and Praveen.
