You think your professor is friendly so you go to her office hours. Imagine a person tosses a coin five times. Each time it comes up heads. The person is asked the probability that the coin will come up tails the next toss. Some women are doctors.
Some doctors are smart.
Therefore, some women are smart. The argument is not logically valid. The argument is logically valid. It is impossible to tell whether the argument is logically valid. Tom confronted his friend Mary because he thought that Mary was saying mean things about him behind his back.