The CAS Registry Mumber 128973-76-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,8,9,7 and 3 respectively; the second part has 2 digits, 7 and 6 respectively. Calculate Digit Verification of CAS Registry Number 128973-76: (8*1)+(7*2)+(6*8)+(5*9)+(4*7)+(3*3)+(2*7)+(1*6)=172 172 % 10 = 2 So 128973-76-2 is a valid CAS Registry Number.
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