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Option 1 : 21 : 154
The pattern followed is,
Option 1 → 21 : 154 → 21 : 21 × 7 + 7
Option 2 → 39 : 270 → 39 : 39 × 7 – 3
Option 3 → 31 : 214 → 31 : 31 × 7 – 3
Option 4 → 37 : 256 → 37 : 37 × 7 – 3
All follow the same pattern, except ’21 : 154’.
Hence, “21 : 154” is the number – pair that is different.
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