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Pls answer as quickly as possible!!

Pls answer as quickly as possible!!-example-1
User Adrusi
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1 Answer

3 votes

Answer:

I don't think any of the answer choices are right ...

Explanation:

Using induction (if you would like the steps included, please ask), we can show that
a_n = \frac{1}{\tbinom{n+1}{2}}. We can then simplify the given expression:


(1)/(a_(1670))-1390187=\tbinom{1670+1}{2}-1390187 = 1395285-1390187=5098.

Sorry, but that doesn't appear to be one of the answer choices

User YSelf
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