find a1 of the geometric series using the given information: S6 = 1365 and r = 3.
(show your solution)
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Answer:
3.75.
Step-by-step explanation:
S6 = a1 * (3^6 - 1) / (3-1) = 1365
a1 * 728 / 2 = 1365
728 a1 = 2730
a1 = 2730 / 728
= 3.75
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