Given that there are 6 different waiting rooms in an interview

1. Given that there are 6 different waiting rooms in an interview. At least how many interviewees are there to ensure that there exist 20 people entering the same room?

 2. Today is 15th June, Tuesday. Which day of the week is 3rd November in the same year?

3. From the pattern shown below, what is the number to replace the question mark?
 
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ảnh ở trên là ảnh câu 3 nha!
----- Nội dung dịch tự động từ ảnh -----
27
24
3
13
4
38
11
14
19
26
15
33
18
12
45
7
16