The CAS Registry Mumber 63121-20-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,3,1,2 and 1 respectively; the second part has 2 digits, 2 and 0 respectively. Calculate Digit Verification of CAS Registry Number 63121-20: (7*6)+(6*3)+(5*1)+(4*2)+(3*1)+(2*2)+(1*0)=80 80 % 10 = 0 So 63121-20-0 is a valid CAS Registry Number.
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