1204 MrG What is Proof By Induction

2646 days ago by MATH4R2013

#1)1+2+3+...+n=n(1+n)/2 f(n)=n*(1+n)/2 show(f(1)) show(f(2)) 
       

#1)prove: 1+2+3+...+n+n+1=(n+2)(n+1)/2 #1)assume:1+2+3+...+n =n(n+1)/2 #1)show: n+1=(n+2)(n+1)/2-n(n+1)/2 show(((n+2)*(n+1)/2-n*(n+1)/2).expand())