a 1 = 1, r = 4 20. Find a 7 if a 1 = 12 and r = _1 2 . 21. Find a 6 if a 1 =
Chapter 11, Problem 19(choose chapter or problem)
a 1 = 1, r = 4 20. Find a 7 if a 1 = 12 and r = _1 2 . 21. Find a 6 if a 1 =
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