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September 3rd, 2015, 08:36 AM   #1
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Exclamation Induction 2

Result:420
I keep getting 465.
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September 3rd, 2015, 09:08 AM   #2
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Math Focus: Wibbly wobbly timey-wimey stuff.
Next time please show us what work you've done. That will make it easier for us to help you.

Try this:

$\displaystyle ln \left ( \prod_{k=10}^{30} e^k \right )$

$\displaystyle = \sum_{k=10}^{30} k = \sum_{k=1}^{30} k - \sum_{k = 1}^9 k$

$\displaystyle = \frac{30 \cdot 31}{2} - \frac{9 \cdot 10}{2} = 420$

-Dan
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