This lecture covers the derivation of Fermi and Bose statistics in the grand canonical ensemble, focusing on the high-temperature limit of the distributions. Topics include canonical partition functions for distinguishable and indistinguishable particles, the use of grand-canonical formalism for Bose-Einstein statistics, and the application of Boltzmann statistics in the grand-canonical ensemble. Emphasis is placed on understanding the behavior of independent and indistinguishable particles in different statistical ensembles.