The CAS Registry Mumber 1104-72-9 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 1,1,0 and 4 respectively; the second part has 2 digits, 7 and 2 respectively. Calculate Digit Verification of CAS Registry Number 1104-72: (6*1)+(5*1)+(4*0)+(3*4)+(2*7)+(1*2)=39 39 % 10 = 9 So 1104-72-9 is a valid CAS Registry Number.
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