Of the following sets, which represents a function?

situation a = {student's name, all the colors that the student likes}

situation b = {student's name, the student's favorite math teacher}

only a
only b
both a and b
neither a nor b

As voters exit the polls, you ask a representative random sample of voters if they voted for a proposition. if the true percentage of voters who vote for the proposition is 63%, what is the probability that, in your sample, exactly 5 do not voted for the proposition before 2 voted for the proposition? the probability is