Q. Find the first three partial sums of the series.1+6+11+16+21+26+⋯Write your answers as integers or fractions in simplest form.S1=____S2=____S3=____
Find S2: To find S2, we add the first two terms of the series.S2=1+6S2=7
Find S3: To find S3, we add the first three terms of the series.S3=S2+11S3=7+11S3=18