In a relational database, the three basic operations used to develop useful sets of data are:. a. select, project, and join.
b. select, project, and where.
c. select, from, and join.
d. select, join, and where.

Consider the series where in this problem you must attempt to use the ratio test to decide whether the series converges. compute enter the numerical value of the limit l if it converges, inf if it diverges to infinity, minf if it diverges to negative infinity, or div if it diverges but not to infinity or negative infinity.