Compute the first four partial sums S1,…,S4\displaystyle {S}_{{1}},\ldots,{S}_{{4}}  for the series having n\displaystyle {n} th term an\displaystyle {a}_{{n}} starting with n=1\displaystyle {n}={1}  as follows.

    an=(−1)n6\displaystyle {a}_{{n}}={\left(-{1}\right)}^{{n}}{6}

 S1=\displaystyle {S}_{{1}}=     

 S2=\displaystyle {S}_{{2}}=   

 S3=\displaystyle {S}_{{3}}=     

 S4=\displaystyle {S}_{{4}}=   

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