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We report the 77Se NMR Knight shift and spin-lattice relaxation studies onthe superconducting state of the ternary iron selenide K0.8Fe2-xSe2 with Tc~30K. Just below Tc, the Knight shift 77Kn shows an immediate drop, indicating asinglet pairing. The spin-lattice relaxation rate 1/77T1 decreases rapidly inthe temperature range from TC to Tc/2, which can be fit with an isotropic gapof \Delta~3.8\pm 0.5 k_BTc. The Hebel-Slichter coherence peak is not observed.These data give bulk evidence for a strongly coupled superconductivity withisotropic gaps in K0.8Fe2-xSe2, which is similar to other iron-based hightemperature superconductors. Below Tc/2, the spin-part of the Knight shiftlevels off to a constant value (~0.09%), and the spin-lattice relaxationfollows a 1/T1 T^2 behavior, which are not well understood.

77Se NMR Evidence of Strongly Coupled Superconductivity in K0.8Fe2-xSe2