Asked by Pepsi

Which digit(s) makes 3,71[_] divisible by 3?
   

I don't need help with the answer but what is [_] or is the _ for the missing number?
Answered by PsyDAG
I think it is for the missing number, which would be 4.
Answered by PsyDAG
I think it is for the missing number, which would be 1, 4 or 7
Answered by Pepsi
Oh. Okay thanks
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