Geometric progression
Sequences, series and the binomial theorem · Mathematics
Study notes
Q: Identify r and classify: (a) 3, 6, 12, 24 (b) 100, 50, 25 (c) 2, -6, 18, -54. (a) r = 6/3 = 2. Growing GP. (b) r = 50/100 = 1/2. Shrinking GP. (c) r = -6/2 = -3. Alternating GP (signs flip each term).