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Asked by Adelakun

The 4th term of an arithmetic progression is 6.if the sum of the 8th and 9th terms is -72.what is the common difference
4 years ago

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Answered by R_scott
6 + 4d + 6 + 5d = -72

12 + 9d = -72 ... 9d = -84 ... d = -9 1/3
4 years ago

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