Find the closed form the following a) n sigma (-1)^i * (2i - 1)^2 i=0 b) n sigma (n choose i) * (1/2^i) i=0 c) n sigma (2n choose 2i) * (1/2^i) i=0 d) n sigma (n + i choose i) * (1/2^i) i=0
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