Practice problem
What is the sequence that corresponds to the series 1 + 2 + 3 + 4 + ...?
{1,2,3,4,...}\{1,2,3,4,...\}{1,2,3,4,...}
{0,1,2,3,4,...}\{0,1,2,3,4,...\}{0,1,2,3,4,...}
{...−2,−1,0,1,2,3,4,...}\{...-2,-1,0,1,2,3,4,...\}{...−2,−1,0,1,2,3,4,...}
{1,3,5,9,...}\{1,3,5,9,...\}{1,3,5,9,...}
Type a concept, like “slope” or “photosynthesis”.
