TIMO Khối 4 – Vòng Quốc gia (Heat Round) – Đề số 2

What is the value of the number to represent "?" in the following sequence? 1, 1, 2, 4, 7, 13, 24, ？, 81, 149, …

Value: Giá trị; Represent: Biểu diễn; Sequence: Dãy số.

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.

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.