September 3rd, 2015, 08:36 AM  #1 
Member Joined: Aug 2015 From: Podgorica Posts: 61 Thanks: 0  Induction 2
Result:420 I keep getting 465. 
September 3rd, 2015, 09:08 AM  #2 
Math Team Joined: May 2013 From: The Astral plane Posts: 2,138 Thanks: 872 Math Focus: Wibbly wobbly timeywimey 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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