What are the chances of getting pregnant by someone who had a vasectomy and with someone who has not Who has the greater chance of being the father?

It is virtually impossible that someone who has had a vasectomy and tested clear of sperm would become a father. I agree. Be careful of guys who tell you they've had a vasectomy. A good percentage haven't had one and it's used sometimes to get the woman into bed believing she's safe from getting pregnant. Unless you are living or married to your spouse and no for a fact, don't trust a guy that says he's had one!