+0  
 
0
15
6
avatar+32 

What is the units digit of the sum of the nine terms of the sequence 1! + 1, 2! + 2, 3! + 3, ..., 8! + 8, 9! + 9?

 Aug 7, 2023
 #1
avatar+819 
-2

By a calculator, the sum of the nine numbers is 408235, so the units digit is 5.

 Aug 7, 2023
 #2
avatar+32 
0

sorry, incorrect

jonathanldong  Aug 7, 2023
 #5
avatar+36923 
+1

I get sum = 409158      meaning 8 is the units digit

ElectricPavlov  Aug 7, 2023
 #4
avatar+266 
0

I just used a calculator, I think my answer is correct, maximum if you could show your work?

 

 

Cphil when do you think this bug is gonna get fixed?

I posted 6 answers and ALL of them are flagged. Maybe its because ive been inactive for 2 months?

 P.S please unflag my post

 Aug 7, 2023
edited by Imcool  Aug 7, 2023
edited by Imcool  Aug 7, 2023
 #6
avatar+32 
+1

I found the answer. the sum of those numbers are 409158, so the digit is 8.

 Aug 7, 2023

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