请帮看看！急！

butterfly08

1 S sold 60 copies of book during 7days, it sold different numbers of copies on any 2 of 7days, for the 7days, s sold greatest number copies on Saturday and second greatest number copies on Friday,did S sell more than 11 copies on Friday?

(1) s sold 8 copies on Friday  (2) s sold 38 copies of book on Saturday

answer B

2 T prepared 4 different letters to be sent to 4 different addresses. For each letter,  T prepared an envelope with correct address .If the 4 letters are to be put into 4 envelopes at random ,what is the probability ,that only 1 letter wiil be put into the envelope with its correct address?

answer 1/3
    

请大家帮忙看看吧！请教思路！谢谢！