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11-12-2017
Mathematics

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write the arithmetic sequence that has four arithmetic means between -20 and 20.

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11-12-2017

let the terms be

a , a+d, a+2d, a+3d, a+4d a + 5d

so a = -20
and a + 5d = 20

-20 + 5d = 20
5d = 40 so
d = 8

-20,-12,-4,4,12,20 is the required sequence.

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