Insert three arithmetic means between 3 and 13.

Insert three arithmetic means between 3 and 13.

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Arithmetic means require a common difference d:

3, 3+d, 3+2d, 3+3d, 3+4d=13, 4d=10, d=5/2=2.5

3, 5.5, 8, 10.5, 13.
by Top Rated User (1.2m points)

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