answersLogoWhite

0

The total T of adding numbers from 1 to n is (n x (n+1))/2; consider if n=10:

adding 1+ 2+ 3+...+ 8+ 9+ 10= T and

adding 10+ 9+ 8+...+ 3+ 2+ 1= T (the same answer)

Now add the the two lines together--->

11+11+11+..+11+11+11= 2T, so there are 10 11s

10 x 11 =2T, divide both sides of the equal sign by 2

(10 x 11)/2 =T

So, where n=10, T=55

User Avatar

Wiki User

14y ago

Still curious? Ask our experts.

Chat with our AI personalities

FranFran
I've made my fair share of mistakes, and if I can help you avoid a few, I'd sure like to try.
Chat with Fran
MaxineMaxine
I respect you enough to keep it real.
Chat with Maxine
JordanJordan
Looking for a career mentor? I've seen my fair share of shake-ups.
Chat with Jordan

Add your answer:

Earn +20 pts
Q: What is the total of all numbers added from 1 to 100?
Write your answer...
Submit
Still have questions?
magnify glass
imp