Equation Riddle
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In a mathematical quiz, you are asked the following question:
Use three 9s in a mathematical expression without dividing or multiplying to form the number one.
Can you answer the question? 
The question says “Use three 9s in a mathematical expression…” It does NOT say that you shouldn’t use any other digits / numbers. 🙂
Being so, there are an infinite number of possible, valid answers, such as ‘1000 – 999’.
Your Answer
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