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Mathematics 16 Online
OpenStudy (anonymous):

Find S15 for 1 + 1.5 + 2.25 + 3.375 +... This one I have absolutely no idea about.

OpenStudy (mertsj):

1 x 1.5 = 1.5 1.5 x 1.5 = 2.25 2.25 x 1.5 = 3.375

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