Discussion
Which one of the following pairs is the odd one out ?
Answer: B
The odd pair is ZBN-EHU.
Add the alphabet positions of the letters in each half of a pair. In three pairs the second group's total is 18 more than the first:
| Pair | First total | Second total | Difference |
|---|---|---|---|
| SJF-MPX | 19+10+6 = 35 | 13+16+24 = 53 | 18 |
| NRB-IXS | 14+18+2 = 34 | 9+24+19 = 52 | 18 |
| PSD-KYU | 16+19+4 = 39 | 11+25+21 = 57 | 18 |
| ZBN-EHU | 26+2+14 = 42 | 5+8+21 = 34 | -8 |
Only ZBN-EHU breaks the rule, so it is the odd one out.
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