[填空题]
A seafood restaurant 32 s(rjachesq6:m-n9y 1hm xy conducrjy m92go9.-ame d cnz7lknap /(hw6+ts a promotional campaign during the month of April. Over the 30 days, there will be 15 days with a 50 \% discount on drinks and 10 days with a 50 \% discount on meals. However, on 8 of the days there will be no discount on either drinks or meals.
/-2j9d k6zmcya nen.hlagp+r7 w (9mo 1. Calculate the number of days there will be a 50 % discount for both drinks and meals.
2. Find the probability that, for a guest coming to the restaurant for dinner on a random day in April, the guest will receive a 50 \% discount on either drink or food, but not both.≈
