The CAS Registry Mumber 28838-80-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,8,8,3 and 8 respectively; the second part has 2 digits, 8 and 0 respectively. Calculate Digit Verification of CAS Registry Number 28838-80: (7*2)+(6*8)+(5*8)+(4*3)+(3*8)+(2*8)+(1*0)=154 154 % 10 = 4 So 28838-80-4 is a valid CAS Registry Number.
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