Number of paramagnetic complexes among the following is ____. [ MnBr_4]^2-,[ NiCl_4]^2-,[ Ni ( CN )_4]^2-,[ Ni ( CO )_4],[ CoF_6]^3-,[ Fe ( CN…

Number of paramagnetic complexes among the following is $\displaystyle \_\_\_\_$. $\displaystyle \left[\mathrm{MnBr}_4\right]^{2-},\left[\mathrm{NiCl}_4\right]^{2-},\left[\mathrm{Ni}(\mathrm{CN})_4\right]^{2-},\left[\mathrm{Ni}(\mathrm{CO})_4\right],\left[\mathrm{CoF}_6\right]^{3-},\left[\mathrm{Fe}(\mathrm{CN})_6\right]^{4-},\left[\mathrm{Mn}(\mathrm{CN})_6\right]^{3-},\left[\mathrm{Ti}(\mathrm{CN})_6\right]^{3-}$, $\displaystyle \left[\mathrm{Cu}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+},\left[\mathrm{Co}\left(\mathrm{C}_2 \mathrm{O}_4\right)_3\right]^{3-}$