cho tứ giác ABCD .gọi M, N lần lượt là trung điểm các cạnh AD, BC. chứng minh rằng MN=AB MN=DC thì ABCD là hình bình hành

step-by-step explanation:

amount of oatypop that contains the prize = 40%

amount   of oatypop which doesn't contain the prize = (100-40)=60%

probability that hannah will win a prize

    = s +f s +f f s+ff   f s+ff f f s+ infinity.where f= failure,s= success

=   or 60%

probability that hannah only has to buy 3 or less boxes before getting a prize= (s) and ( f s) and (ff s) and (f f f s)

        = = 87.04 %  

step-by-step explanation:

i think it might be a but you might want a second opinion