The question was, "How many factors do 28 and 32 have in common?" Hoot answered two (2 and 4), omitting 1.
Was he wrong?
I'm not sure this has necessarily been taught consistently in school. I learned that only composite numbers and prime numbers are factors (not in those terms at the time though). The point being that 1, which is neither prime nor composite, is not a factor.
What do you think? Was Hoot Gibson and the charity he was playing for, The Astronaut Scholarship Foundation, screwed out of $975,000?"