Hello,

I have been stuck with the following integration problem for a while now:

$\displaystyle

\int_{0}^{b}\int_{0}^{b}\ldots\int_{0}^{b} \mbox{exp}\left(c(x_1+x_2+\ldots+x_N)^2\right)dx_1 dx_2\ldots dx_N, c>0

$

Any help would be appreciated. Thanks.