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luhn: sync docs #2827

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Aug 3, 2024
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luhn: sync docs #2827

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3 changes: 2 additions & 1 deletion exercises/practice/luhn/.docs/instructions.md
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Original file line number Diff line number Diff line change
Expand Up @@ -22,7 +22,8 @@ The first step of the Luhn algorithm is to double every second digit, starting f
We will be doubling

```text
4_3_ 3_9_ 0_4_ 6_6_
4539 3195 0343 6467
↑ ↑ ↑ ↑ ↑ ↑ ↑ ↑ (double these)
```

If doubling the number results in a number greater than 9 then subtract 9 from the product.
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