Created by StemPy LabAn infinite geometric progression has a sum of 18, and its second term is 4. What are all the possible values of its first term? Choose the option that lists every possible value and no others.
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← An arithmetic progression has its ninth term equal to five times its second term, while its twelfth term is 47. Find the total of its first twenty terms.For two arithmetic progressions, the ratio of the sums of their first n terms is (3n + 8) : (7n + 15), for every positive integer n. What is the ratio of their 12th terms? →
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