Compute the first four terms of the sequence of partial sums for the series: ∑n=1[infinity](1/2)^n−1 S1= 1 equation editorEquation Editor S2= 3/2 equation editorEquation Editor S3= 7/4 equation editorEquation Editor S4= 15/8 equation editorEquation Editor Note: answers should be simplified and should not contain decimals. Part 2. Find a formula for the nth partial sum, Sn, that depends only on n.