The constant e is defined as Let Sn be the sum of just the first n terms above, .e., S1-1 and i=1 for n 2 2. That is, 1 2 and so on. Write a function in R to calculate Sn. Use it to make a plot of Si to S1s (make sure that your plain text file includes not only your function, but also the code needed to produce your plot; the plot itself should be embedded in your PDF file). (HINT: Notice that S2 S and so on.)