If MAHINDRA is coded as ARDNIHAM, then INFOSYS is coded as

Concept: In this type of coding-decoding question, each word is encoded by reversing the order of its letters — the last letter becomes the first, the second-last becomes the second, and so on, until the whole word is written back-to-front.

Application:

1. Write out MAHINDRA letter by letter: M-A-H-I-N-D-R-A. Reversing this order gives A-R-D-N-I-H-A-M, which exactly matches the given code ARDNIHAM — confirming the rule is "reverse the letters of the word."

2. Apply the same rule to INFOSYS: write out its letters I-N-F-O-S-Y-S.

3. Reverse the order of these letters: S-Y-S-O-F-N-I.

4. This gives the code SYSOFNI.

Cross-check: Reversing SYSOFNI again gives back INFOSYS (S-Y-S-O-F-N-I reversed = I-N-F-O-S-Y-S), confirming the derived code is correct.