hd14yarnell
28.11.2019 •
Mathematics
2. determine the sum of the first 400 odd numbers.
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Ответ:
Odd numbers take the form , where is an integer. When , the last odd number would be 799. So we're adding
By reversing the order of terms, we have
and we can pair up terms in both sums at the same position to write
so that we are basically adding 400 copies of 800, and from there we can find the value of the sum right away:
###
We could also make use of the formulas,
We have
Ответ:
sorry i dont quite understand, were you given more information
Step-by-step explanation: