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We successfully grew the high-quality single crystal ofRb$_{0.78}$Fe$_2$Se$_{1.78}$, which shows sharp superconducting transition inmagnetic susceptibility and electrical resistivity. Resistivity measurementsshow the onset superconducting transition ($T_{\rm c}$) at 32.1 K and zeroresistivity at 30 K. From the low-temperature iso-magnetic-fieldmagnetoresistance, large upper critical field $H_{\rm c2}$(0) has beenestimated as high as 180 T for in-plane field and 59 T for out-of-plane field.The anisotropy $H^{ab}_{\rm c2}$(0)/$H^{c}_{\rm c2}$(0) is around 3.0, rightlying between those observed in K$_x$Fe$_2$Se$_2$ and Cs$_x$Fe$_2$Se$_2$.

Superconductivity at 32 K in single crystal Rb$_{0.78}$Fe$_2$Se$_{1.78}$}