Exercise 8.1.3: Arithmetic and geometric sequences. About Give the first six terms of the following sequences. You can assume that the sequences start with an index of 1. (a) A geometric sequence in which the first value is 2 and the common ratio is 3. (b) An arithmetic sequence in which the first value is 2 and the common difference is 3. (c) A geometric sequence in which the first value is 27 and the common ratio is 1/3.