SSC CGL Reasoning · Chapter Test
Coding–Decoding — 25-Question Test
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Formula Reference Sheet
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Decoding toolkit
| Position values | A=1, B=2, … Z=26 |
|---|---|
| Forward shift | new = old + k (wrap Z→A) |
| Backward shift | new = old − k (wrap A→Z) |
| Opposite letter | 27 − position (A↔Z) |
| Reverse coding | write the word backwards |
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