6
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I tried to find the product of $k(k-1)$ from $k=2$ to $n$.

The partial product values should be 12 at 3 and 144 at 4. But it's showing the wrong partial product. What went wrong?

Screenshot

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  • 2
    $\begingroup$ This looks ok to me. $\endgroup$ – Zubzub Jun 11 '18 at 14:59
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    $\begingroup$ Works fine for me as well. $\endgroup$ – lulu Jun 11 '18 at 15:00
  • $\begingroup$ I don't know why WolframAlpha is showing different result for the same query! $\endgroup$ – user569084 Jun 11 '18 at 15:02
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    $\begingroup$ "Works for me too" If you look down at the table of values, it shows what we expect. If you expand the "partial products" tab with the button "show points" it gives what the OP points out as seemingly incorrect information. So, that begs the question, what information does the "show points" button convey and how does that differ from the table of values below? $\endgroup$ – JMoravitz Jun 11 '18 at 15:03
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    $\begingroup$ My assumption is that it treats the "first partial product" as the partial product with one term, i.e. the partial product that occurs when $n=2$. It treats the "second partial product" as the partial product with two terms, i.e. the partial product that occurs when $n=3$, etc... $\endgroup$ – JMoravitz Jun 11 '18 at 15:06

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