UPSC Prelims 2021·CSAT·Logical Reasoning·Coding Decoding

In a certain code language 'MATHEMATICS' is written as 'LBSIDNZUHDR'. How is 'CHEMISTRY' written in that code language?

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Last updated 23 May 2026, 3:31 pm IST
  1. ADIDLHRSSX
  2. BBIDNHTSSXCorrect
  3. CBIDLHTSSX
  4. DDGFLIRUQZ

Explanation

To solve this, we look at how each letter in MATHEMATICS is transformed into LBSIDNZUHDR. The pattern follows an alternating sequence of minus one and plus one for each letter. M minus 1 is L A plus 1 is B T minus 1 is S H plus 1 is I E minus 1 is D M plus 1 is N A minus 1 is Z T plus 1 is U I minus 1 is H C plus 1 is D S minus 1 is R Applying this same minus 1, plus 1 pattern to CHEMISTRY: C minus 1 is B H plus 1 is I E minus 1 is D M plus 1 is N I minus 1 is H S plus 1 is T T minus 1 is S R plus 1 is S Y minus 1 is X Following this pattern, CHEMISTRY becomes BIDNHTSSX, which corresponds to option B.
Logical Reasoning: In a certain code language 'MATHEMATICS' is written as 'LBSIDNZUHDR'. How is 'CHEMISTRY' written in that code language?

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