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?

jonathanldong Aug 7, 2023

#1**-2 **

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

maximum Aug 7, 2023

#4**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**

Imcool Aug 7, 2023

#6**+1 **

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

jonathanldong Aug 7, 2023