Use sigma notation to represent the following series for the first 12 terms. 2 +(-8) +32 + (-128) + ......

∑[ (-1)^(n + 1) 2^(2n - 1)], n=1 to 12 = - 6,710,886

\(\displaystyle -\frac{1}{2}\sum \limits_{n=1}^{12}(-4)^n\)