The CAS Registry Mumber 83912-89-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,3,9,1 and 2 respectively; the second part has 2 digits, 8 and 9 respectively. Calculate Digit Verification of CAS Registry Number 83912-89: (7*8)+(6*3)+(5*9)+(4*1)+(3*2)+(2*8)+(1*9)=154 154 % 10 = 4 So 83912-89-4 is a valid CAS Registry Number.
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