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1. What is the value of the number to represent “?” in the following sequence? Value: Giá trị; Represent: Biểu diễn; Sequence: Dãy số. 1, 1, 2, 4, 7, 13, 24, ？ , 81, 149, …

2. According to the pattern shown below, how many circle(s) is / are there from the 1st to the 200th figure counting from the left? Pattern: Quy luật; Circles: Hình tròn; Figure: Hình vẽ.

3. A stationery store had a batch of ball pens. One half but 2 fewer pens were sold on the first day. One half of the remaining part but 3 fewer pens were sold on the second day.Finally, 11 ball pens are left. How many ball pen(s) did the stationery store have originally? One half: Một nửa; Fewer: Ít hơn; Remaining: Còn lại; Originally: Lúc đầu.

4. John wrote a 3-digit number on a piece of paper and asked Peter to guess it. Peter asked: “Is the number 723?” John replied: “One of the digits is correct. The position of that digit is also correct.” Peter asked again: “Is the number 745?” John replied: “One of the digits is correct. The position of that digit is wrong.” Peter asked again: “Is the number 842?” John said: “One of the digits is correct. The position of that digit is also correct.” Given that all the digits in that 3-digit number are all different, what is the number written by John? 3-digit number: Số có 3 chữ số; Digit: Chữ số; Position: Vị trí.

5. There are a total of 40 tigers and cranes in a zoo. The animals have a total of 104 legs. How many tiger(s) is / are there? Total: Tổng cộng.