  Quasiparticles of the fractional quantum Hall systems obey fractional
(including mutual) exclusion statistics. In this note we study the effects of
exclusion statistics on thermal activation of quasiparticle pairs in the
approximation of generalized ideal gas. The distribution function for thermally
activated quasiparticles is found explicitly for the statistics matrix given by
the composite fermion picture and the thermodynamic consequences are discussed
analytically. In particular, at low temperatures, there is a
quasielectron-quasihole duality in the description of the system between two
adjacent magic fillings $\nu(m,p)\equiv m/(2pm+1)$ and $\nu(m+1,p)$.
