We improve here two results from the preprints [DK], [AFKK] on approximating matrices by random submatrices. We use a construction of a random subset of a finite set, which is different from what was suggested in [AFKK]. Instead of taking a random q-element subset of an n-element set, we consider independent {0, 1}-valued random variables δ1, . . . , δn, taking value 1 with probability δ = q/n....