Question: 8) 3649 = 3 0 1 1
Use the given digits in each group to form the greatest 4-digit number, and the least 4-digit number, and one 4-digit number that is in between.
9)
9
6
1
2
10)
5
4
3
8
11)
4
4
5
2
12)
9
0
7
3
Graph shapes and math position hints:
top-left: fish-shaped number frame with digits 9, 6, 1, 2; form greatest, least, and one in-between 4-digit number.
top-right: fish-shaped number frame with digits 5, 4, 3, 8; form greatest, least, and one in-between 4-digit number.
bottom-left: fish-shaped number frame with digits 4, 4, 5, 2; form greatest, least, and one in-between 4-digit number.
bottom-right: fish-shaped number frame with digits 9, 0, 7, 3; form greatest, least, and one in-between 4-digit number.
1. **Problem Statement:**
Given four digits, form the greatest 4-digit number, the least 4-digit number, and one 4-digit number in between using those digits.
2. **Important Rules:**
- The greatest number is formed by arranging digits in descending order.
- The least number is formed by arranging digits in ascending order.
- The in-between number is any valid 4-digit number using the digits that is neither the greatest nor the least.
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### For digits 9, 6, 1, 2 (Problem 9):
- Greatest number: $\text{9 6 2 1} = 9621$
- Least number: $\text{1 2 6 9} = 1269$
- One in-between number: $\text{6 9 2 1} = 6921$
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### For digits 5, 4, 3, 8 (Problem 10):
- Greatest number: $\text{8 5 4 3} = 8543$
- Least number: $\text{3 4 5 8} = 3458$
- One in-between number: $\text{5 8 4 3} = 5843$
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### For digits 4, 4, 5, 2 (Problem 11):
- Greatest number: $\text{5 4 4 2} = 5442$
- Least number: $\text{2 4 4 5} = 2445$
- One in-between number: $\text{4 5 4 2} = 4542$
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### For digits 9, 0, 7, 3 (Problem 12):
- Greatest number: $\text{9 7 3 0} = 9730$
- Least number: $\text{0 3 7 9}$ is not a 4-digit number because it starts with 0, so the least valid 4-digit number is $\text{3 0 7 9} = 3079$
- One in-between number: $\text{7 9 3 0} = 7930$