3
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Given:

Devil as you know is $ 666 $

Using digits 1 to 9 in strict ascending order and only three mathematical signs ( +, -, /, x ... of these are allowed), write the Pandigital expression

$ 666 = $

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  • $\begingroup$ Parentheses or concatenation? $\endgroup$ – Jonathan Allan May 17 at 18:54
  • $\begingroup$ Concatenated Numbers only..no other operators other than specified $\endgroup$ – Uvc May 17 at 18:57
6
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Assuming that concatenation is allowed

$1234 – 567 + 8 – 9 = 666$ (using three signs: -, + and -)

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4
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Here's one:

$666=123+456+78+9$


(I initially thought this was one, but the restriction being made is to use three operation instances, rather than three of the set of allowed operations)

$666=123+45-6+7\times 8\times 9$

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  • $\begingroup$ Only 3 mathematical signs permitted as per the puzzle $\endgroup$ – Uvc May 17 at 19:09
  • $\begingroup$ yeah plus, minus and multiply. $\endgroup$ – Jonathan Allan May 17 at 19:10
  • $\begingroup$ Oh only three instances ? $\endgroup$ – Jonathan Allan May 17 at 19:11
  • $\begingroup$ Found one using three instances and updated. $\endgroup$ – Jonathan Allan May 17 at 19:21

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