[en] Cross sections of ³He, ³H and ²H stripping fragment production in collisions of α-particles with tantalum and propane at 4.2 GeV/c per nucleon are determined. The negative and charge particle multiplicities in these events are obtained. The experimental values of the cross sections are in good agreement with the multiscattering model. It is shown that the dependence of probabiliby of ³He, ³H and ²H fragments emission on the nucleus- target atomic weight is described by the multiscattering model. Experimental data on negative particles multiplicity in the events with the ³He and ³H fragments escape, correspond to the interaction of one bombarding nucleon. The multiplicity value obtained coincides with the average multiplicity value in nucleon-nucleon interactions normalized for inelastic cross section