[填空题]
A seafood restaurant conducts a -bq* hkwfhn; jlty:re(((bd3 promotional campaign during the mocw .zqr30-m0mo 8atmynth of April. Over the 30 days, there will be 15 days with a 50 \% discount on drinks and 10 days with a 50 0 rm0tow 8y3m.maczq- \% discount on meals. However, on 8 of the days there will be no discount on either drinks or meals.
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.≈
