math
posted by wan .
4 digit number 12*6 is a perfect square.the value of the digit represented by * is ?

math 
Reiny
Just put in some number
e.g. 1256
√1256 = appr 35.44
but we know that it must end in a 6, so it has to be 36
36^2 = 1296
so the missing number is a 9
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