The CAS Registry Mumber 12681-83-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,2,6,8 and 1 respectively; the second part has 2 digits, 8 and 3 respectively. Calculate Digit Verification of CAS Registry Number 12681-83: (7*1)+(6*2)+(5*6)+(4*8)+(3*1)+(2*8)+(1*3)=103 103 % 10 = 3 So 12681-83-3 is a valid CAS Registry Number.
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