Math puzzle has the following content:
In the picture there are 6 equal squares, each square has 4-digit numbers.
- Cell 1: 7122
- Box 2: 6521
- Box 3: 8332
- Box 4: 4743
- Box 5: 9911
- Box 6: 387?
Your task is to find the number hidden behind the question mark in box number 6. Stay calm, calculate carefully, and find the pattern of each number.

In 15 seconds, can you find the number hidden behind the question mark?
If you find the answer in the shortest time, scroll down to the comments to record and see how many people think the same as you.
Source: https://vtcnews.vn/trong-15-giay-do-ban-tim-ra-chu-so-an-sau-dau-hoi-cham-ar949268.html
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