therealplug6 therealplug6

27-07-2017
Mathematics

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–14, –7, 0, 7, 14, …
Find the 19th term…

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mreijepatmat mreijepatmat

27-07-2017

This is an Arithmetic progression with d = 7
[-7-(14) = 0-(-7) = 14-7] =7
The q1st term is = - 14
The nth term in a AP = first term + (n-1)d, where n = the rank of the term:

Value of the 19th term a₁₉ = (-14)(19-1)(7) = (-14)(18)(7) = - 1764

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