Which online communities for depression have the highest concentrations of extremely intelligent people ?
How do i solve -LSB- math -RSB- \ begin -LCB- vmatrix -RCB- 1 + a & 1 & 1 \ \ 1 & 1 + b & 1 \ \ 1 & 1 & 1 + c \ end -LCB- vmatrix -RCB- -LSB- / math -RSB- ?