 Even when given explanations, simulations, and formal mathematical proofs, many people still do not accept that switching is the best strategy .Paul Erdős, one of the most prolific mathematicians in history, remained unconvinced until he was shown a computer simulation demonstrating vos Savant's predicted result (Vazsonyi 1999).The problem is a paradox of the "veridical" type, because the correct choice (that one should switch doors) is so counterintuitive it can seem absurd, but is nevertheless demonstrably true.