  In this short paper, we show that the solution set of a combination of
equilibrium problems is not necessary contained in the intersection of a finite
family of solution sets of equilibrium problems. As a corollary, we deduce that
statements in recent papers given by S. Suwannaut, A. Kangtunyakarn (Fixed
Point Theory Appl. 2013, 2014; Thai Journal of Maths. 2016), W. Khuangsatung,
A. Kangtunyakarn (Fixed Point Theory Appl. 2014), and A.A. Khan, W. Cholamjiak,
and K.R. Kazmi (Comput. Appl. Maths. 2018) are not correct.
