Question

Find an explict formula for the arthematic sequence 170,85,0,-85,...........d(n)=?

Answer 1

Given,

170,85,0,-85,........... in Arithmetic sequence

a1, a2, a3, ............

common difference d = a2 - a1

common difference d = 85 - 170

common difference d = -85

an = a + (n - 1) d

an = 170 + (n - 1) (-85)

an = 170 - 85n + 85

an = 255 - 85n

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