8 The given by a) Find SM of n term of a certain series is S...

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8 The given by a) Find SM of n term of a certain series is S = (-1)^-1 4,--3 42=3 the first three terms of the series. u= b) Show that the terms of the series are in geometric progression. 8 The given by a) Find SM of n term of a certain series is S = (-1)^-1 4,--3 42=3 the first three terms of the series. u= b) Show that the terms of the series are in geometric progression.