Consider the following sequence. \(\displaystyle{s}_{{n}}={2}{n}−{1}\)

a) Find the first three terms of the sequence whose nth term is given.

\(\displaystyle{s}_{{1}}=\)

\({s}_{{2}}=\)

\({s}_{{3}}=\)

b) Classify the sequence as arithmetic, geometric, both, or neither. arithmeticgeometric bothneither If arithmetic, give d, if geometric, give r, if both, give d followed by r. (If both, enter your answers as a comma-separated list. If neither, enter NONE.)