Mathematics, 04.02.2022 02:50 cduke1919
The first four terms of an arithmetic sequence are: a, a + d, a + 2d, a + 3d. The first
four terms of another sequence are: A, Ar, Ar2, Ar3, where r 6= 1. The eight terms
satisfy:
a + A = 27 (1)
(a + d) + (Ar) = 27 (2)
(a + 2d) + (Ar2) = 39 (3)
(a + 3d) + (Ar3) = 87 (4)
By using the substitution a = 27 − A, or otherwise, find the all eight terms
Answers: 3
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The first four terms of an arithmetic sequence are: a, a + d, a + 2d, a + 3d. The first
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