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2 changes: 1 addition & 1 deletion data/part-12/3-functional-programming.md
Original file line number Diff line number Diff line change
Expand Up @@ -650,7 +650,7 @@ If the initial value is left out, `reduce` takes the first item in the list as t

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**NB:** if the items in the series are of a different type than the intended reduced result, the thrd argument is mandatory. The example with the bank accounts would not work without the initial value. That is, trying this
**NB:** if the items in the series are of a different type than the intended reduced result, the third argument is mandatory. The example with the bank accounts would not work without the initial value. That is, trying this

```python
balances_total = reduce(balance_sum_helper, accounts)
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