The proof says that -(adsbygoogle = window.adsbygoogle || []).push({});

Let,

S_{n}= a+(a+d)+(a+2d)+....+(a+(n-2)d)+(a+(n-1)d)----->1

S_{n}= (a+(n-2)d)+(a+(n-1)d)+...+a+(a+d)+(a+2d)------>2

Now if we have to add such things(1 and 2) how would we do that?

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Arithmetic Progression formula proof

**Physics Forums | Science Articles, Homework Help, Discussion**