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# A brain teaser

How can we construct 1 by using numbers from 0 to 9 exactly once and not using 0 as index ?

Note by Tanuj Sur
3 years, 11 months ago

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I just found a solution by a little bit of trial and error : $$(-9+8+7-6+5-3+2)/4 + 0/1$$

- 3 years, 11 months ago

Questions: What is "index"? What are the allowed operations/functions? Are we allowed to use brackets? Are we allowed to rearrange the numbers (seems so)? Are we allowed to concatenate numbers?

- 3 years, 11 months ago

That's not given in the question!!!

- 3 years, 11 months ago