Given the numbers $2, 2, 10$ and $11$. Can we form $12$ with using each number exactly once and using standard operators. You are not allowed to use concatenation: $10+\frac{22}{11}=12$ is not allowed. I've been able to make every number up to $300$, but I haven't been able to do $12$, yikes. Any help is appreciated!
Using 2, 2, 10 and 11, make 12
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number-theory
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0We can repeat numbers? – 2017-02-28
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0I don't think so. We must use them all. – 2017-02-28
2 Answers
3
$$(11-\frac{10}{2})\cdot 2=12$$
2
$$2 \cdot (2-10+11)!=12$$ where ! denotes factorial.