Question

Prove:
\[
\gcd(a,a-b)=\gcd(a,b)
\]

Answer 1

we did this few days back ?

Answer 2

http://gyazo.com/49a1f5ce028b5d2fc280fd32c64badb1

Answer 3

XD

Answer 4

Yes but I am hopelessly brainless. Somehow Openstudy is working on iPad but not on the computer.

Answer 5

Ohk.. lets walk through this again when you're back maybe :)

Answer 6

I always forget that \(\gcd(a,b)|a\) and \(\gcd(a,b)|b\).