Which of the following express 1 – 3 + 5 –7+9 in sigma notation? Select one: a.(-1)* (2k + 1) only k=0 O b.all of them 3 c. (-1)*+1 (2k + 3) only С. k=-1 d.(-1)*-(2k – 1) only

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Sequence and Series

A sequence is defined as a collection of things. Series is defined to sum the things one by one in the sequence.  It was invented by German mathematician Carl Friedrich Gauss.