Can someone help me prove by contradiction that for non-negative integers n, 1+2+3....n = n(n+1) / 2 ?
I know that conradiction proof is when statement p->q, -q ->-p should be true, there for proved by contradiction. However that does not make sense on above statement..
jdh1231 0 Newbie Poster
rubberman 1,355 Nearly a Posting Virtuoso Featured Poster
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