Use Binomial Thm to determine 4th term of (2x3 - 1)7. Illustrate problem set up and final answer. Simplify final answer. Remember that when finding terms, begin counting with j=0. 1st term matches to j=0 2nd term matches to j = 2-1 or 1 3rd term matches to j=3-1 or 2 4th term matches to j = 4-1 or 3 etc.