Answer / shiva sahu

sum these numbers :394=3+9+4=16,391=13,19=10,16=7,4=4,1=-2
substract every time 3.

Answer / vasudha aggarwal

answer is -2

Answer / somasundarraj

ANSWER Is=1
Explain:

394-3=391 then take root sqrt(391)=19-3=16 then take root
sqrt(16)=4-3=1 then take root sqrt(1)=1

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