QUIZ 4. Four Single Digit Numbers
I've found two answers so far.
- \(1, 3, 8, 9\)
- \(10 = 1 + 9\)
- \(20 = 9 \times 3 - 8 + 1\)
- \(30 = 3 \times (1 + 9)\)
- \(40 = 8 \times (9 - 3 - 1)\)
- \(50 = 3 \times (9 + 8) - 1\)
- \(60 = 9 \times (8 - 1) - 3\)
- \(70 = 9 \times 8 - 3 + 1\)
- \(80 = 8 \times (9 + 1)\)
- \(90 = 9 \times (8 + 3 - 1)\)
- \(2, 2, 5, 8\) (Probably the most intuitive answer)
- \(10 = 2 \times 5\)
- \(20 = 8 \times 5 \div 2\)
- \(30 = (8 - 2) \times 5\)
- \(40 = 8 \times 5\)
- \(50 = 5 \times (8 + 2)\)
- \(60 = 5 \times 2 \times (8 - 2)\)
- \(70 = 5 \times (8 \times 2 - 2)\)
- \(80 = 5 \times 8 \times 2\)
- \(90 = 5 \times (8 \times 2 + 2)\)
I haven't bruteforced this yet so there may be other answers.
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