A common objection argues that if a single report is only probable, joining many such reports cannot produce certainty. The response is that the evidential force of a properly structured whole need not be identical to the force of each isolated part.
Independent testimony may reinforce itself sufficiently to exclude relevant possibilities of error or fabrication. In that situation the composite report differs from a solitary, uncorroborated statement.
This is not a mechanical calculation in which any ten uncertainties automatically become certainty. Independence and the transmission circumstances matter. If all ten repeat one mistaken source, their apparent multiplication adds little. Genuine tawātur concerns the changed epistemic force of suitably supported collective testimony.