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PRACTICE B: 1. Find the sum of the first six terms of the geometric sequence 3, -6, 12, -24,... 2. Find the sum of the terms of a geometric sequence where the first term is 4, the last term is 324 and the common ratio is 3. 3. What is the sum to infinity of 3, -1, 1/3, -1/9,...? 4. Find the seventh term of the harmonic sequence 1/3, 1/7, 1/11, . 5. If F =6 and F, = 3, list the first 8 terms of this Fibonacci-type sequence