explain why we know m<CBA=m<DBA but we don't know that m<CAB=m<DAB. Mark the known equal angles

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