Simplify (6x^2 − 3 + 5x^3) − (4x^3 − 2x^2 − 16).

2x^3 − x^2 + 21
−2x^3 + x^2 − 21
x^3 + 8x^2 + 13
−x^3 − 8x^2 + 13

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