Find an explicit formula for a sequence of the form a1, a2, a3, ... with the initial terms given in Description below.

Question

0, (-1/2), (2/3), (-3/4), (4/5), (-5/6), (6/7)

Answer 1

f(n) = [ {(-1)^(n-1)} (n-1)]/n, n=1,2,3,

f(n) = (-1)^(n-1) * (n-1)

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n