Question

How do you write 1 - 1/2 + 1/4 - 1/8 + ... in sigma notation?

Answer 1

\[\sum_{0}^{n} (-1)^i*(1/2^i)\]

Answer 2

\[\sum_{i=0}^{n}(-1)^i*(1/2^i)\] yeh right

Answer 3

i thnkk