The CAS Registry Mumber 139871-83-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,9,8,7 and 1 respectively; the second part has 2 digits, 8 and 3 respectively. Calculate Digit Verification of CAS Registry Number 139871-83: (8*1)+(7*3)+(6*9)+(5*8)+(4*7)+(3*1)+(2*8)+(1*3)=173 173 % 10 = 3 So 139871-83-3 is a valid CAS Registry Number.
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