The CAS Registry Mumber 123919-28-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,3,9,1 and 9 respectively; the second part has 2 digits, 2 and 8 respectively. Calculate Digit Verification of CAS Registry Number 123919-28: (8*1)+(7*2)+(6*3)+(5*9)+(4*1)+(3*9)+(2*2)+(1*8)=128 128 % 10 = 8 So 123919-28-8 is a valid CAS Registry Number.
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